netdev - Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

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Message-ID: <a08621850808110053j5cbf23e6xdf52c9e7440abf19@mail.gmail.com>
Date:	Mon, 11 Aug 2008 09:53:54 +0200
From:	"Dushan Tcholich" <dusanc@...il.com>
To:	"Francois Romieu" <romieu@...zoreil.com>
Cc:	"Robert Hancock" <hancockr@...w.ca>, netdev@...r.kernel.org
Subject: Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

Hi

On Sun, Aug 10, 2008 at 9:00 PM, Dushan Tcholich <dusanc@...il.com> wrote:
> Hi
> Sorry for answering this late, but I was short on time and couldn't
> get reiser4 to work with 2.6.27-rc2
>
> On Thu, Aug 7, 2008 at 8:58 PM, Francois Romieu <romieu@...zoreil.com> wrote:
>> Dushan Tcholich <dusanc@...il.com> :
>> [...]
>>> I googled a little and found out that oprofile is a little above my head.
>>> So as I thought that some driver or HW might be responsible for this I
>>> tried to disable various onboard HW and found out that if I disable
>>> onboard ethernet problem dissapears, so now I've added netdev and
>>> maintainer of R8169 driver to cc.
>>
>> Can you try 2.6.27-rc2 and send the content of /proc/interrupts, dmesg,
>> ifconfig as well as a capture of the strange output from top ?
>>

I tried some more kernels and I had the same problem with 2.6.23.17
and 2.6.27-rc1-mm1, but I couldn't reproduce it with kernel from
sysresccd 1.0.1 http://www.sysresccd.org/ which is a patched version
of 2.6.24 i think .7 when I booted it to change fs.
Could it be that something in userspace is creating this?

> I've copied my root to ext3 partition and with vanilla 2.6.27-rc2 I got:
> -With my .config problem is still here
> -With only rtl8169 removed from config there is no problem
>
>> It seems rather benign though.
>>
> Well I wouldn't agree from power managment standpoint :). This nic is
> in a lot of laptops.
> 8% of 2.13GHz Core2Duo CPU is a lot :)
>
> Btw. should LKML be removed from cc?
> If you need any more help please ask.
> I hope I'm not harrasing you too much :)
>> --
>> Ueimor
>>
> Have a nice day
> Dushan
>
...
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