Date: Tue, 28 Feb 2006 13:27:38 -0600
From: Matt Mackall <mpm@selenic.com>
To: Gautam H Thaker <gthaker@atl.lmco.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>
Subject: Re: ~5x greater CPU load for a networked application when using 2.6.15-rt15-smp vs. 2.6.12-1.1390_FC4
Message-ID: <20060228192738.GO4650@waste.org>
References: <43FE134C.6070600@atl.lmco.com>
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On Thu, Feb 23, 2006 at 02:55:56PM -0500, Gautam H Thaker wrote:
> The real-time patches at the URL below do a great job of endowing Linux with
> real-time capabilities.
> 
> http://people.redhat.com/mingo/realtime-preempt/
> 
> It has been documented before (and accepted) that this patch turns Linux into
> a RT kernel but considerably slows down the code paths, esp. thru the I/O
> subsystem. I want to provide some additional measurements and seek opinions
> of if it might ever be possible to improve on this situation.

Are you using the SLAB or SLOB allocator in the -rt kernel?

-- 
Mathematics is the supreme nostalgia of our time.
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