topic Re: about s32G sd card read write slow in S32G

about s32G sd card read write slow

hardy2023 — Thu, 25 May 2023 09:21:10 GMT

hi,

we now is using s32G , and find fileIO is realy slow.

we use sd card which spec with 120-190M/s for reading . but we test only get 14.7 M/s.

sd card is SanDisk）64GB TF（MicroSD）存储卡 U1 C10 A1 至尊高速移动版内存卡读速140MB/s

and we install sysbench and do IO testing , only get read speed 14.7 M /s. also we test random write speed get 3.42M/S.

BTW. we have a OS run at emmc which get Read 81 M/S Write 84.74M/S .

t@ubuntu-s32g399ardb3:~$ sysbench --test=fileio --file-num=16 --file-total-size=1G prepare

WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.

sysbench 1.0.11 (using system LuaJIT 2.1.0-beta3)

16 files, 65536Kb each, 1024Mb total

Creating files for the test...

Extra file open flags: 0

Creating file test_file.0

Creating file test_file.1

Creating file test_file.2

Creating file test_file.3

Creating file test_file.4

Creating file test_file.5

Creating file test_file.6

Creating file test_file.7

Creating file test_file.8

Creating file test_file.9

Creating file test_file.10

Creating file test_file.11

Creating file test_file.12

Creating file test_file.13

Creating file test_file.14

Creating file test_file.15

1073741824 bytes written in 113.74 seconds (9.00 MiB/sec).

t@ubuntu-s32g399ardb3:~$ sysbench --test=fileio --file-total-size=1G --file-test-mode=rndrd --max-time=180 --max-requests=100000000 --num-threads=16 --file-num=16 --file-extra-flags=direct --file-fsync-freq=0 --file-block-size=16384 run

WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.

WARNING: --num-threads is deprecated, use --threads instead

WARNING: --max-requests is deprecated, use --events instead

WARNING: --max-time is deprecated, use --time instead

sysbench 1.0.11 (using system LuaJIT 2.1.0-beta3)

Running the test with following options:

Number of threads: 16

Initializing random number generator from current time

Extra file open flags: 3

16 files, 64MiB each

1GiB total file size

Block size 16KiB

Number of IO requests: 100000000

Read/Write ratio for combined random IO test: 1.50

Calling fsync() at the end of test, Enabled.

Using synchronous I/O mode

Doing random read test

Initializing worker threads...

Threads started!

File operations:

reads/s: 941.68

writes/s: 0.00

fsyncs/s: 0.00

Throughput:

read, MiB/s: 14.71

written, MiB/s: 0.00

General statistics:

total time: 180.0166s

total number of events: 169524

Latency (ms):

min: 3.92

avg: 16.99

max: 52.89

95th percentile: 24.83

sum: 2879865.98

Threads fairness:

events (avg/stddev): 10595.2500/30.58

execution time (avg/stddev): 179.9916/0.00

Re: about s32G sd card read write slow

Daniel-Aguirre — Thu, 25 May 2023 17:18:39 GMT

Hi,

Which voltage are you supplying to the SD interface? Also, which BSP version are you using?

HS card requires IO voltage to be switched from 3.3V to 1.8V to work in UHS mode.

Please, let us know.

Re: about s32G sd card read write slow

hardy2023 — Fri, 26 May 2023 04:03:32 GMT

hi Daniel, thanks for your suggestion .

we found at RMS32G-VNP-RDB3.pdf maybe PD_09 pin could change the 3.3 to 1.8V .

Users can select the connection of the SD card or eMMC by SW3. When SW3 is set to “ON” status, the
S32G399A is connected to SD card interface, and IO level can be selected by VSELECT(PD_09) pin. If
VSELECT pin is low level or Hi-Z state, the uSDHC IO level is 3.3V; if VSELECT is high level, the uSDHC IO
level is 1.8V. When SW3 is set to “OFF” status, the S32G399A is connected to eMMC, the IO level is always
1.8V.

Now we try to install libgpiod-tools to set PD_09 pin . and got error with " cannot find line" . do you have any sugestion ?

t@ubuntu-s32g399ardb3:/ssd/libgpio/libgpiod$ sudo gpiodetect
gpiochip0 [4009d700.siul2-gpio] (191 lines)
gpiochip1 [0-0022] (24 lines)
gpiochip2 [SJA1110-gpiochip] (16 lines)
t@ubuntu-s32g399ardb3:/ssd/libgpio/libgpiod$ sudo gpioinfo gpiochip0
gpioinfo: cannot find line 'gpiochip0'

t@ubuntu-s32g399ardb3:/ssd/libgpio/libgpiod$ sudo gpioinfo
gpiochip0 - 191 lines:
line 0: "PA_00" input
line 1: "PA_01" input
line 2: "PA_02" input
line 3: "PA_03" input
line 4: "PA_04" input
line 5: "PA_05" input
line 6: "PA_06" input
line 7: "PA_07" input
line 8: "PA_08" input
line 9: "PA_09" input

t@ubuntu-s32g399ardb3:/ssd/libgpio/libgpiod$ sudo gpioget --bias=pull-up gpiochip0 73
gpioget: cannot find line 'gpiochip0'
gpioget: cannot find line '73'

Re: about s32G sd card read write slow

hardy2023 — Fri, 26 May 2023 06:34:07 GMT

BTW : BSP is 35.0

Re: about s32G sd card read write slow

Daniel-Aguirre — Fri, 26 May 2023 19:53:46 GMT

Hi,

Thanks for your feedback.

We see that you are using the ubuntu image. We are using the non-ubuntu image (the out-of-the-box BSP, with modifications) and by deleting the property of 'no-1-8-v' under the dts file we can obtain the following result:

We followed what it is stated under Chapter 3.3 of the AN13667 [Page 11, eMMC Enablement and Debugging Tips, Rev. 1, 08/2022] to modify the dts file. Once compiled, we replaced the DTB file that is located under the boot partition of the SD card.

Please, let us know.