linux-kernel - Re: [patch, v2.6.22-rc6] sys

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Message-Id: <20070626122006.c94cb2c4.sfr@canb.auug.org.au>
Date:	Tue, 26 Jun 2007 12:20:06 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roman Zippel <zippel@...ux-m68k.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch, v2.6.22-rc6] sys_time() speedup

On Mon, 25 Jun 2007 15:15:08 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Mon, 25 Jun 2007 23:09:46 +0200
> Roman Zippel <zippel@...ux-m68k.org> wrote:
> 
> > On Monday 25 June 2007, Ingo Molnar wrote:
> > 
> > > the patch improves the sysbench OLTP macrobenchmark significantly:
> > 
> > Has that any real practical relevance?
> 
> Interesting question.  The patch adds a new test-n-branch to gettimeofday()
> so if gettimeofday() is used much more frequently than time(), we lose.

Isn't gettimeofday() called *lots* by the X server and programs - one of
the reasons we bother putting it in the VDSO.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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