netdev - Re: about latencies

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Message-ID: <alpine.DEB.1.10.0904240958070.20479@qirst.com>
Date:	Fri, 24 Apr 2009 10:00:17 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Michael Chan <mchan@...adcom.com>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: about latencies

On Fri, 24 Apr 2009, Eric Dumazet wrote:

> > you're running a latency sensitive test on a NOHZ kernel below, isn't that
> > a bad idea?
>
> I tried worst case to match (eventually) Christoph data.
> I usually am not using NOHZ, but what about linux distros ?

Why does NOHZ have an impact here? Timed wakeups can happen using
high res timers after all and a timer interrupt should be generated if the
network layer needs it.

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