APPLIED: SRU: [PATCH] [maverick|natty]/ti-omap4 usb: ehci i/o fix

Tim Gardner tim.gardner at canonical.com
Wed Sep 14 13:36:36 UTC 2011


On 09/14/2011 07:15 AM, Paolo Pisati wrote:
> SRU Justification:
>
> This is the famous patch from Ming Lei that fixes the abysmal perfomance
> problem we had on usb on arm platforms.
>
> Impact:
> 	- without the patch, 'dd' over usb mass storage is about 4~5MB/sec.
>
> Fix:
> 	- After applying the patch, 'dd' over usb mass storage is about 14~16MB/sec.
>
> BugLink: http://bugs.launchpad.net/bugs/709245
>
> The same patch already hit Oneric, proposing for Maverick and Natty.
>
> Ming Lei (1):
>    usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
>
>   drivers/usb/host/ehci-q.c |   18 ++++++++++++++++++
>   drivers/usb/host/ehci.h   |   17 +++++++++++++++++
>   2 files changed, 35 insertions(+), 0 deletions(-)
>


-- 
Tim Gardner tim.gardner at canonical.com




More information about the kernel-team mailing list