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

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Message-ID: <a08621850808311214j6a9ca210j8141164e50bc0f74@mail.gmail.com>
Date:	Sun, 31 Aug 2008 21:14:50 +0200
From:	"Dushan Tcholich" <dusanc@...il.com>
To:	"Stephen Hemminger" <shemminger@...tta.com>
Cc:	"Francois Romieu" <romieu@...zoreil.com>,
	"Robert Hancock" <hancockr@...w.ca>, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

Hi

On Sun, Aug 31, 2008 at 7:05 PM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> On Sun, 31 Aug 2008 10:51:46 +0200
> "Dushan Tcholich" <dusanc@...il.com> wrote:
>
>> Hello
>> I found the culprit.
>>
>> When using powertop I get:
>> Top causes for wakeups:
>>   35,2% (251,0)                ip : br_stp_enable_bridge (br_hello_timer_expired
>>
>> So I tried to turn them off with:
>> brctl sethello br0 0
>> but the problem persisted.
>
>
> You can't turn off the hello timer, it is needed for Spanning Tree to
> work. The kernel should reject requests to set hello timer < 1sec.
> Most routers allow 1 - 10sec.
>
> I am going to do a new patch to add tighter range checking for STP timer
> settings and another to default fowarding delay of zero if STP is disabled.
>
Well I try to turn stp off but it doesn't  want to :)
This is in my /etc/conf.d/net
brctl_br0=( "setfd 0" "sethello 10" "stp off" )
I had problems with sethello 0 so now I'm using 10.
Tried with
brctl stp br0 off
but still had same troubles.

Have a nice day
Dushan
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