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From: Arjan van de Ven <arjan@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>, Andi Kleen <andi@firstfloor.org>,
tglx@linutronix.de, linux-kernel@vger.kernel.org,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: More breakage in native_rdtsc out of line in git-x86
Date: Wed, 9 Jan 2008 12:25:59 -0800 [thread overview]
Message-ID: <20080109122559.38bc8c33@laptopd505.fenrus.org> (raw)
In-Reply-To: <20080109174800.GA15346@one.firstfloor.org>
On Wed, 9 Jan 2008 18:48:00 +0100
> And after all that's still by far the most common system call
> (not only for databases; i profiled this using systemtap in some
> loads some time ago and it usually came up with >50%)
> and quite important for many workloads.
>
btw be careful with this; the X server uses gettimeofday in it's equivalent of udelay()...
(and we all know how useful it is to make the delay loops faster ;-)
next prev parent reply other threads:[~2008-01-09 20:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-09 3:55 More breakage in native_rdtsc out of line in git-x86 Andi Kleen
2008-01-09 5:21 ` More breakage in native_rdtsc out of line in git-x86 II Andi Kleen
2008-01-09 9:09 ` More breakage in native_rdtsc out of line in git-x86 Ingo Molnar
2008-01-09 14:19 ` Andi Kleen
2008-01-09 15:22 ` Ingo Molnar
2008-01-09 15:51 ` Andi Kleen
2008-01-09 16:30 ` Ingo Molnar
2008-01-09 17:48 ` Andi Kleen
2008-01-09 20:25 ` Arjan van de Ven [this message]
2008-01-09 20:40 ` Andi Kleen
2008-01-09 20:57 ` H. Peter Anvin
2008-01-09 22:09 ` Björn Steinbrink
2008-01-09 22:28 ` Andi Kleen
2008-01-09 22:35 ` Harvey Harrison
2008-01-09 22:41 ` Andi Kleen
2008-01-09 23:21 ` Björn Steinbrink
2008-01-09 23:37 ` Paolo Ciarrocchi
2008-01-11 5:21 ` Cyrill Gorcunov
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