netdev - Re: Network latency regressions from 2.6.22 to 2.6.29 (results with IRQ affinity)

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Message-ID: <20090420194410.GA26909@ioremap.net>
Date:	Mon, 20 Apr 2009 23:44:10 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>,
	Michael Chan <mchan@...adcom.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev@...r.kernel.org
Subject: Re: Network latency regressions from 2.6.22 to 2.6.29 (results with IRQ affinity)

Hi.

On Mon, Apr 20, 2009 at 01:29:54PM -0400, Christoph Lameter (cl@...ux.com) wrote:
> > I only took traces on receivers to rule out different coalescing delays
> > of NIC that could depend on firmware or version
> 
> Hmmm... Okay there could be a firmware influence....

Can you replace the driver in one or another kernel?
Can those be scheduler (I said wrong words I know) iteractions? Maybe
test with sched_rt priority?

-- 
	Evgeniy Polyakov
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