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i.MX6 and SATA performance

Question asked by Giuseppe Pagano on Aug 29, 2012
Latest reply on Aug 30, 2012 by Giuseppe Pagano

Hi, does any one tested SATA support on i.MX6 platform ('I'm using a custom sabre lite board).


We have performance problem, just few minutes after boot sata disk halves troughput and we can't recover it any more. Seem not to be a power management problems, because performance slow down also in the middle of disk activity !


At start up performance are good:

root@linaro-ubuntu-desktop:~# hdparm -t /dev/sda

    Timing buffered disk reads: 188 MB in  3.01 seconds =  62.51 MB/sec
root@linaro-ubuntu-desktop:~# uptime
    ..... up 1 min,  ....

But after a while became worst:

root@linaro-ubuntu-desktop:~# hdparm -t /dev/sda
 Timing buffered disk reads:  88 MB in  3.03 seconds =  29.00 MB/sec
root@linaro-ubuntu-desktop:~# uptime
    ..... up 3 min,  ..


I also ask the same question on Bugs & Issues, sorry for the cross posting.