Re: [patch, v2.6.22-rc6] sys_time() speedup

[Stephen Rothwell]

On Mon, 25 Jun 2007 15:15:08 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Mon, 25 Jun 2007 23:09:46 +0200
> Roman Zippel <zippel@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxx
http://www.canb.auug.org.au/~sfr/

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