netdev - Re: [PATCH] Re: Bad network performance over 2Gbps

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Message-ID: <480A46CA.4080608@vyatta.com>
Date:	Sat, 19 Apr 2008 12:23:54 -0700
From:	Stephen Hemminger <stephen.hemminger@...tta.com>
To:	7eggert@....de
CC:	Kok@...r.kernel.org, Auke <auke-jan.h.kok@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Anton Titov <a.titov@...t.bg>, Chris Snook <csnook@...hat.com>,
	"H. Willstrand" <h.willstrand@...il.com>, netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Re: Bad network performance over 2Gbps

Bodo Eggert wrote:
> Kok, Auke <auke-jan.h.kok@...el.com> wrote:
>
>   
>> [X86] IRQBALANCE: Mark as BROKEN and disable by default
>>
>> The IRQBALANCE option causes interrupts to bounce all around on SMP systems
>> quickly burying the CPU in migration cost and cache misses. Mainly affected
>> are network interrupts and this results in one CPU pegged in softirqd
>> completely.
>>     
>
> If this is the problem, maybe it would help to only balance the IRQs each
> e.g. ten seconds? Unfortunately I have no SMP system to try it out.
>
>
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>   
The kernel level IRQBALANCE is useless. The userlevel irqbalance does 
the right thing,
it handles multi-core, and network devices, and all the other special cases.
*Don't use kernel level irqbalance*
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