Comment 60 for bug 709245
Revision history for this message
| Ming Lei (tom-leiming) wrote Re: [Bug 709245] Re: ARM SMP scheduler performance bug | #60 |
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0e1f616
(Get the code!)
Emeric,
On Wed, Jul 11, 2012 at 1:20 AM, Emeric Vigier
<email address hidden> wrote:
> Ming Lei,
>
> Delay between URB submission and call-back for a given URB is huge indeed...
> My hardware (panda rev A3) is fine: linaro-12.05 (kernel-3.4) and linaro-11.09's ethernet works just fine.
Yes, so it may be caused by ehci driver or some ehci-omap low level
configuration.
But I have no idea about the root cause since there are very few
information about
the problem.
Maybe you need to use a USB analyzer to trace the bus traffic if you have it.
Or one easier way is to run 'git bisect' on upstream kernel or stable-tree to
look for the commit which fixes the problem.
Thanks,
--
Ming Lei