From: Lee Revell <rlrevell@joe-job.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Andrew Morton <akpm@osdl.org>,
James Bottomley <James.Bottomley@SteelEye.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Work around for periodic do_gettimeofday hang
Date: Sat, 27 Nov 2004 17:38:40 -0500 [thread overview]
Message-ID: <1101595121.15635.24.camel@krustophenia.net> (raw)
In-Reply-To: <1101370853.2659.1.camel@laptop.fenrus.org>
On Thu, 2004-11-25 at 09:20 +0100, Arjan van de Ven wrote:
> HZ=1000 costs you 1% HPC performance, and for slower machines probably more. Also some hw (with slow smm) really doesn't likeit.
I actually profiled the timer ISR on a 600Mhz C3. It runs for 22 usec.
So with HZ=1000 the residency of the timer interrupt is 2.2%.
Lee
next prev parent reply other threads:[~2004-11-27 22:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-24 16:49 [PATCH] Work around for periodic do_gettimeofday hang James Bottomley
2004-11-24 19:13 ` Arjan van de Ven
2004-11-25 4:27 ` James Bottomley
2004-11-25 4:33 ` Andrew Morton
2004-11-25 4:40 ` James Bottomley
2004-11-25 8:20 ` Arjan van de Ven
2004-11-27 22:38 ` Lee Revell [this message]
2004-11-25 11:18 ` Roman Zippel
2004-11-25 13:42 ` Jan Engelhardt
2004-11-25 15:47 ` Alan Cox
2004-11-25 17:33 ` James Bottomley
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