Message-ID: <44D358C6.3080406@intel.com>
Date: Fri, 04 Aug 2006 07:25:10 -0700
From: Auke Kok <auke-jan.h.kok@intel.com>
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To: Andrew Morton <akpm@osdl.org>
CC: Auke Kok <auke-jan.h.kok@intel.com>, linux-kernel@vger.kernel.org,
       jesse.brandeburg@intel.com, john.ronciak@intel.com,
       netdev@vger.kernel.org, arjan@linux.intel.com
Subject: Re: [RFC] irqbalance: Mark in-kernel irqbalance as obsolete, set
 to N by default
References: <44CE3F5E.4010305@intel.com> <20060803194550.9ff31bc1.akpm@osdl.org>
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Andrew Morton wrote:
> On Mon, 31 Jul 2006 10:35:26 -0700
> Auke Kok <auke-jan.h.kok@intel.com> wrote:
> 
>> We've recently seen a number of user bug reports against e1000 that the 
>> in-kernel irqbalance code is detrimental to network latency. The algorithm 
>> keeps swapping irq's for NICs from cpu to cpu causing extremely high network 
>> latency (>1000ms).
> 
> What kernel versions?  Some IRQ balancer fixes went in shortly after 2.6.17.

user reports show 2.6.17.1 having the problem, I'm trying to get more details 
information, and will ask if 2.6.18rc3 or so does better for them.

Cheers,

Auke
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