Date: Sat, 24 Jan 2004 23:43:49 +0100
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
Message-ID: <20040124224349.GA3946@devserv.devel.redhat.com>
References: <20040124181026.GA22100@codeblau.de> <1074968776.4442.4.camel@laptop.fenrus.com> <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:
> >=20
> > 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....
> >=20
> > I experimented with readahead'ing all that stuff while the initscripts
> > ran in the hope it would save time... but it doesn't somehow.
>=20
> Did you sort the sectors to be read, or just read the files into page cac=
he
> 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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