From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: andrea@suse.de (Andrea Arcangeli)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox),
cswingle@iarc.uaf.edu (Christopher S. Swingley),
linux-kernel@vger.kernel.org
Subject: Re: Linux 2.4.13-ac1
Date: Fri, 26 Oct 2001 18:54:00 +0100 (BST) [thread overview]
Message-ID: <E15xBBA-0000pp-00@the-village.bc.nu> (raw)
In-Reply-To: <20011026194301.M30905@athlon.random> from "Andrea Arcangeli" at Oct 26, 2001 07:43:01 PM
> simply because the <2.4.10 buffer cache layer wasn't able to do proper
> readahead on the blkdev. Now we do readahead properly and so in turn
> the the lack of media-change trust of the vfs shows up. So as far I can
> tell the right fix have no influence on the blkdev in pagecache, but it
> only consists in resurrecting the media-change detection with a
> per-device bitflag whitelist. I cannot see other source of stalls across
> a close/open cycle.
I'm not currently sure if the impact is from the cost of the page cache
flushing or the invalidate/re-read it triggers. There probably are two or
three seeks on the DVD if the data is invalidated so that would make sense.
Alan
next prev parent reply other threads:[~2001-10-26 17:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.kgfmokv.12jgvrv@ifi.uio.no>
2001-10-26 16:04 ` John Weber
2001-10-26 17:23 ` Christopher S. Swingley
2001-10-26 17:35 ` Alan Cox
2001-10-26 17:43 ` Andrea Arcangeli
2001-10-26 17:54 ` Alan Cox [this message]
2001-10-26 18:00 ` Andrea Arcangeli
2001-10-26 14:50 Alan Cox
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