topic Re: microSD card write hangs on P4080 in P-Series

topic Re: microSD card write hangs on P4080 in P-Series https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279260#M849 <HTML><HEAD></HEAD><BODY><P>There is a similar know issue in SDK 1.2 release, a call trace can occur when test SD performance with ext4 filesystem, please refer to the following workaround.</P><P>1. Use ext2 filesystem.</P><P>2. Increase the timeout value (in kernel configuration) and decrease the dirty_ratio in proc file system.</P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">menuconfig: </SPAN></P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">Kernel hacking</SPAN></P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">(xxx) Default timeout for hung task detection (in seconds)</SPAN></P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;"><BR /></SPAN></P><P>proce file system:</P><P>echo xx > /proc/sys/vm/dirty_ratio</P><P>echo xx > /proc/sys/vm/dirty_background_ratio</P><P></P><P>In addition you could update the software to SDK 1.4(Kernel 3.8), if you would like to.</P></BODY></HTML> Fri, 15 Nov 2013 07:18:40 GMT yipingwang 2013-11-15T07:18:40Z microSD card write hangs on P4080 https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279259#M848 <HTML><HEAD></HEAD><BODY><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Hi All,</P><P></P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">We are using Kernel 3.0.34 ( from SDK 1.2) on our  P4080 board. We are using microSD card and have our filesystem on it.</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">The Write operation on SD card randomly hangs and eventually Kernel causes following exception, The same can be reproduce if we write continuously on uSD card with dd command.</P><P></P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">INFO: task dd:2184 blocked for more than 120 seconds.</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">dd              D 0ff1d604     0  2184   2163 0x00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Call Trace:</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401940] [00000003] 0x3 (unreliable)</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401a00] [c0007654] __switch_to+0x94/0xc0</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401a20] [c0607068] __schedule+0x268/0x610</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401b50] [c0607860] schedule+0x30/0xd0</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401b60] [c01ac8d4] do_get_write_access+0x2c4/0x470</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401bd0] [c01acc00] jbd2_journal_get_write_access+0x30/0x60</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401be0] [c0191658] __ext4_journal_get_write_access+0x38/0xa0</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401c00] [c0174010] ext4_reserve_inode_write+0x90/0xc0</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401c20] [c0174068] ext4_mark_inode_dirty+0x28/0x1b0</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401c50] [c0179718] ext4_dirty_inode+0x38/0x70</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401c60] [c010ca3c] __mark_inode_dirty+0x3c/0x220</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401c80] [c0117294] generic_write_end+0xe4/0x110</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401ca0] [c0177ad4] ext4_da_write_end+0x1a4/0x370</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401ce0] [c00a637c] generic_file_buffered_write+0xdc/0x230</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401d50] [c00a6ef8] __generic_file_aio_write+0x238/0x4d0</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401dc0] [c00a7218] generic_file_aio_write+0x88/0x150</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401e10] [c016cff4] ext4_file_write+0x134/0x330</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401e60] [c00e2c68] do_sync_write+0xa8/0x130</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401ef0] [c00e35a8] vfs_write+0xa8/0x1a0</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401f10] [c00e391c] sys_write+0x4c/0x90</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[c7401f40] [c000f340] ret_from_syscall+0x0/0x3c</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">--- Exception: c01 at 0xff1d604</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">    LR = 0x100044c8</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Kernel panic - not syncing: hung_task: blocked tasks</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Call Trace:</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[e6743ea0] [c0007d64] show_stack+0x44/0x160 (unreliable)</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[e6743ee0] [c060a4d0] panic+0xac/0x1ec</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[e6743f40] [c008f254] watchdog+0x254/0x270</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[e6743fa0] [c0065fdc] kthread+0x7c/0x80</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">[e6743ff0] [c000e208] kernel_thread+0x4c/0x68</P><P></P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;"><STRONG style="font-style: inherit; font-family: inherit;">More Information::::</STRONG></P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">After looking into uSD card messages ( enabled SD/MMC debug logs) the SD card continuously responds with following messages and never completes its write operation,</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: req done (CMD13): 0: 00000c00 00000000 00000000 00000000</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">mmc0: starting CMD13 arg aaaa0000 flags 00000195</P><P></P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">I am using Kingston 8GB and tried other cards like Toshiba, Lexar etc they all fails at some point of time.</P><P></P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Any help will be highly appreciated, this is causing us major block now.</P><P></P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Thanks</P><P style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Yogesh </P></BODY></HTML> Thu, 14 Nov 2013 19:13:00 GMT https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279259#M848 yogesh_ahiray 2013-11-14T19:13:00Z Re: microSD card write hangs on P4080 https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279260#M849 <HTML><HEAD></HEAD><BODY><P>There is a similar know issue in SDK 1.2 release, a call trace can occur when test SD performance with ext4 filesystem, please refer to the following workaround.</P><P>1. Use ext2 filesystem.</P><P>2. Increase the timeout value (in kernel configuration) and decrease the dirty_ratio in proc file system.</P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">menuconfig: </SPAN></P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">Kernel hacking</SPAN></P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">(xxx) Default timeout for hung task detection (in seconds)</SPAN></P><P><SPAN style="color: #51626f !important; padding-bottom: 10px !important;"><BR /></SPAN></P><P>proce file system:</P><P>echo xx > /proc/sys/vm/dirty_ratio</P><P>echo xx > /proc/sys/vm/dirty_background_ratio</P><P></P><P>In addition you could update the software to SDK 1.4(Kernel 3.8), if you would like to.</P></BODY></HTML> Fri, 15 Nov 2013 07:18:40 GMT https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279260#M849 yipingwang 2013-11-15T07:18:40Z Re: microSD card write hangs on P4080 https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279261#M850 <HTML><HEAD></HEAD><BODY><P>Hi Yiping,</P><P></P><P>Thank you for the reply. I tried the above workarounds but no help. Once the card entered in that state it is not coming out of that, even I reboot the board. Only power cycle brings card out of that state. Can you please explain what is the exact problem here. </P><P></P><P>Thanks</P><P>Yogesh </P></BODY></HTML> Mon, 18 Nov 2013 19:17:10 GMT https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279261#M850 yogesh_ahiray 2013-11-18T19:17:10Z Re: microSD card write hangs on P4080 https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279262#M851 <HTML><HEAD></HEAD><BODY><P>Please refer to the know issue of SDK 1.2 release, this problem can be found in 64 bit platform more frequently, </P><P>this workaround has been verified by the testing team, it should work. In addition, this problem has been fixed in SDK 1.4 release.</P><P></P><TABLE border="1" cellpadding="4" cellspacing="0" frame="border" rules="all" style="color: #51626f; margin-left: auto; margin-right: auto; text-align: left; font-family: arial, sans-serif; font-size: 12px; font-style: normal; font-weight: normal; text-indent: 0px;" summary=""><TBODY style="color: #51626f !important;"><TR style="color: #51626f !important;"><TD class="cellrowborder" headers="d374434e23 " style="color: #51626f; font-family: arial, sans-serif; border-left-style: none; border-top-style: none; border-right-style: solid; border-right-width: 1px; border-bottom-style: solid; border-bottom-width: 1px;" valign="top" width="8.333333333333332%">SDK-227665</TD><TD class="cellrowborder" headers="d374434e26 " style="color: #51626f; font-family: arial, sans-serif; border-left-style: none; border-top-style: none; border-right-style: solid; border-right-width: 1px; border-bottom-style: solid; border-bottom-width: 1px;" valign="top" width="41.66666666666667%">A call trace can occur when running "iozone" with ext4 filesystem to test SD performance on P5040DS 64-bit.</TD><TD class="cellrowborder" headers="d374434e29 " style="color: #51626f; font-family: arial, sans-serif; border-left-style: none; border-top-style: none; border-right-style: solid; border-right-width: 1px; border-bottom-style: solid; border-bottom-width: 1px;" valign="top" width="41.66666666666667%"><OL style="color: #51626f !important; margin-top: 5px; margin-right: 15px; margin-bottom: 5px; margin-left: 15px; list-style-image: none;"><LI>Use ext2 filesystem.</LI><LI>Increase the timeout value (in kernel configuration) and decrease the dirty_ratio in proc file system.</LI></OL><UL><LI><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">menuconfig:</SPAN><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">Kernel hacking</SPAN><SPAN style="color: #51626f !important; padding-bottom: 10px !important;">(xxx) Default timeout for hung task detection (in seconds)</SPAN></LI><LI>proce file system:echo xx > /proc/sys/vm/dirty_ratio echo xx > /proc/sys/vm/dirty_background_ratio </LI></UL></TD><TD class="cellrowborder" headers="d374434e32 " style="color: #51626f; font-family: arial, sans-serif; border-left-style: none; border-top-style: none; border-right-style: solid; border-right-width: 1px; border-bottom-style: solid; border-bottom-width: 1px;" valign="top" width="8.333333333333332%"> </TD></TR></TBODY></TABLE></BODY></HTML> Tue, 19 Nov 2013 04:21:31 GMT https://community.nxp.com/t5/P-Series/microSD-card-write-hangs-on-P4080/m-p/279262#M851 yipingwang 2013-11-19T04:21:31Z