From: Arjan van de Ven <arjanv@redhat.com>
To: Ville Herva <vherva@twilight.cs.hut.fi>,
Felix von Leitner <felix-kernel@fefe.de>,
linux-kernel@vger.kernel.org
Subject: Re: Request: I/O request recording
Date: Sat, 24 Jan 2004 23:43:49 +0100 [thread overview]
Message-ID: <20040124224349.GA3946@devserv.devel.redhat.com> (raw)
In-Reply-To: <20040124192545.GW11115091@niksula.cs.hut.fi>
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On Sat, Jan 24, 2004 at 09:25:45PM +0200, Ville Herva wrote:
> On Sat, Jan 24, 2004 at 07:26:17PM +0100, you [Arjan van de Ven] wrote:
> >
> > I recently did something like this (and it scared me, it seems a typical
> > Fedora boot into gnome opens like 11.000 files ;) but via a printk in
> > the kernel....
> >
> > I experimented with readahead'ing all that stuff while the initscripts
> > ran in the hope it would save time... but it doesn't somehow.
>
> Did you sort the sectors to be read, or just read the files into page cache
> in randomish order ?
semi random order but mostly submitted in parallel so the kernel has lots of
freedom to reorder
> Or do you mean that even after all the files were read into cache, the X
> startup time didn't get any better (not counting the cache priming)?
I mean that the time it takes to prime is just about exactly the time you
then win... eg net gain of about zero
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next prev parent reply other threads:[~2004-01-24 22:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-24 18:10 Request: I/O request recording Felix von Leitner
2004-01-24 18:23 ` Valdis.Kletnieks
2004-01-24 18:26 ` Arjan van de Ven
2004-01-24 19:25 ` Ville Herva
2004-01-24 22:43 ` Arjan van de Ven [this message]
2004-01-24 20:11 ` Diego Calleja
2004-01-24 21:09 ` Ville Herva
2004-01-24 23:35 ` Andrew Morton
2004-01-24 23:53 ` Davide Libenzi
2004-01-25 0:03 ` Andrew Morton
2004-01-25 0:09 ` Davide Libenzi
2004-01-25 0:04 ` Valdis.Kletnieks
2004-01-25 0:10 ` Davide Libenzi
2004-01-25 12:26 ` Felipe Alfaro Solana
2004-01-25 22:59 ` Bart Samwel
2004-01-25 23:09 ` Andrew Morton
2004-01-25 23:29 ` Bart Samwel
2004-01-25 23:38 ` Andrew Morton
2004-01-26 0:23 ` Diego Calleja García
2004-01-26 0:32 ` Andrew Morton
2004-01-26 11:50 ` Bart Samwel
2004-01-26 11:57 ` Andrew Morton
2004-01-27 19:13 ` Bart Samwel
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