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

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Message-Id: <E1JnEcl-0000xc-D9@be1.7eggert.dyndns.org>
Date:	Sat, 19 Apr 2008 17:05:06 +0200
From:	Bodo Eggert <7eggert@....de>
To:	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

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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