Date: Fri, 5 Mar 2004 15:34:25 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Peter Zaitsev <peter@mysql.com>, Andrew Morton <akpm@osdl.org>,
       riel@redhat.com, mbligh@aracnet.com, linux-kernel@vger.kernel.org
Subject: Re: 2.4.23aa2 (bugfixes and important VM improvements for the high end)
Message-ID: <20040305143425.GA11604@elte.hu>
References: <20040228072926.GR8834@dualathlon.random> <Pine.LNX.4.44.0402280950500.1747-100000@chimarrao.boston.redhat.com> <20040229014357.GW8834@dualathlon.random> <1078370073.3403.759.camel@abyss.local> <20040303193343.52226603.akpm@osdl.org> <1078371876.3403.810.camel@abyss.local> <20040305103308.GA5092@elte.hu> <20040305141504.GY4922@dualathlon.random>
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* Andrea Arcangeli <andrea@suse.de> wrote:

> > vsyscall-sys_gettimeofday and vsyscall-sys_time could help quite some
                                  ^^^^^^^^^^^^^^^^^
> > for mysql. Also, the highly threaded nature of mysql on the same MM
> 
> he said he doesn't use gettimeofday frequently, so most of the flushes
> are from other syscalls.

you are not reading Pete's and my emails too carefully, are you? Pete
said:

> [...] MySQL does not use gettimeofday very frequently now, actually it
> uses time() most of the time, as some platforms used to have huge
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> performance problems with gettimeofday() in the past.
>
> The amount of gettimeofday() use will increase dramatically in the
> future so it is good to know about this matter.

	Ingo
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