Re: [android-kernel] Digest for android-kernel@googlegroups.com - 1 Message in 1 Topic

[Purushotham Reddy]

Hi,

I had worked with pandaboard and I have not faced this issue till now. Maybe you could tell us more on problem so that we can suggest you a possible solution.

With regards and thanks,

Purushotham Reddy A

On Sat, Jul 14, 2012 at 6:45 AM, <android...@googlegroups.com> wrote:

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• ethernet and usb host storage very slow on android-omap-panda-3.0 [1 Update]

 ethernet and usb host storage very slow on android-omap-panda-3.0

m-ric <emeric...@gmail.com> Jul 12 12:26PM -0700  

Hi,
 
I run AOSP-4.0.4 on a pandaboard rev A3. I got linux kernel from
remotes/android-omap/android-omap-panda-3.0 branch, 52f4764 commit
"Revert gpu: pvr: Revert to 1.8@550175".
 
With this software:
1. Ethernet bandwidth is very low, barely usable for file transfers.
TX gets stuck, I measured 20KBps. RX is quite slow too.
2. USB storage on USB host port suffers same limitations. I measured
~100KBps.
 
Problem is known though, fedora- and ubuntu guys saw it:
http://article.gmane.org/gmane.linux.redhat.fedora.arm/1266
https://bugs.launchpad.net/linux-linaro/+bug/709245
 
My kernel embeds Ming Lei's barrier patch in ehci-q.c:
usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
and Will Deacon's ARM errata CONFIG_PL310_ERRATA_769419:
ARM: 7161/1: errata: no automatic store buffer drain
I checked that asm on this latter commit is fine (dsb instr.).
 
Still above bugs are still present. For fedora and ubuntu guys though,
above fixes have solved the problem.
I am reluctant to change my (entire) kernel because everything else
that I need works fine. I am in a maturation phase, not in a
development phase anymore.
 
Does anyone experience that on pandaboard and aosp?
Did you find any workaround?
 
I have been on this bug for 4 weeks now. I am kind of desperate right
now.


 

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