linux-kernel - Re: More breakage in native_rdtsc out of line in git-x86

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Message-ID: <20080109122559.38bc8c33@laptopd505.fenrus.org>
Date:	Wed, 9 Jan 2008 12:25:59 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: More breakage in native_rdtsc out of line in git-x86

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 ;-)
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