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Message-ID: <20080831100537.6929c51e@extreme>
Date: Sun, 31 Aug 2008 10:05:37 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: "Dushan Tcholich" <dusanc@...il.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
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.
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