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Date:	Sat, 19 Apr 2008 17:05:06 +0200
From:	Bodo Eggert <>
To:, Auke <>,
	Ingo Molnar <>,
	Thomas Gleixner <>,
	"H. Peter Anvin" <>,
	Linux Kernel Mailing List <>,
	Anton Titov <>, Chris Snook <>,
	"H. Willstrand" <>,,
	Jesse Brandeburg <>,
	Linus Torvalds <>,
	Andrew Morton <>
Subject: Re: [PATCH] Re: Bad network performance over 2Gbps

Kok, Auke <> 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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