From: Martin Dalecki <dalecki@evision-ventures.com>
To: Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
Cc: Daniel Phillips <phillips@bonn-fries.net>,
Linus Torvalds <torvalds@transmeta.com>,
Rik van Riel <riel@conectiva.com.br>,
Andreas Dilger <adilger@turbolabs.com>,
Andrea Arcangeli <andrea@suse.de>,
Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: linux-2.4.10-pre5
Date: Tue, 11 Sep 2001 18:13:13 +0200 [thread overview]
Message-ID: <3B9E3819.90F21593@evision-ventures.com> (raw)
In-Reply-To: <20010911155953Z16272-1367+16@humbolt.nl.linux.org> <1033942741.1000228033@[10.132.112.53]>
Alex Bligh - linux-kernel wrote:
>
> --On Tuesday, September 11, 2001 6:07 PM +0200 Daniel Phillips
> <phillips@bonn-fries.net> wrote:
>
> > There is clearly something nonoptimal about the hardware readahead and/or
> > caching.
>
> Partly I guess that the disk h/w cache is the wrong side of a potential
> IO bottleneck - i.e. you can read faster from main memory than from
> any disk cache.
But during the read from the disk you can do different things in
paralell.
Think DMA! And then please remember my posts from a year ago:
We have already 3 different read-ahead layers in Linux!
Read it twice THRE one on top of the other:
1. Physical.
2. Inside the driver.
2a. block device layer.
3. File system layer.
And in addition to this there is:
2a. or maybe even 2b if you take MD and RAID into account as well.
And plase remember that each of them can fight against the other becouse
they all presume different ordering mechanisms.
next prev parent reply other threads:[~2001-09-11 16:19 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-08 4:18 linux-2.4.10-pre5 Linus Torvalds
2001-09-08 6:32 ` linux-2.4.10-pre5: drivers/net/wan compile fixes Eyal Lebedinsky
2001-09-08 6:36 ` 2.4.9-ac10 (not 2.4.10-pre5!) wan fixes Eyal Lebedinsky
2001-09-08 8:32 ` 2.4.10-pre5 compile error George Bonser
2001-09-08 17:19 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-08 17:30 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-08 17:57 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-08 18:01 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 1:09 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 1:20 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 1:38 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 1:53 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 2:22 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 2:31 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 3:30 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 3:58 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 4:16 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 4:28 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 12:09 ` linux-2.4.10-pre5 Rik van Riel
2001-09-09 14:53 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 18:17 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 20:18 ` linux-2.4.10-pre5 H. Peter Anvin
2001-09-10 0:39 ` linux-2.4.10-pre5 Simon Kirby
2001-09-10 8:30 ` linux-2.4.10-pre5 Kai Henningsen
2001-09-11 5:29 ` linux-2.4.10-pre5 Peter Samuelson
2001-09-11 11:29 ` linux-2.4.10-pre5 Kai Henningsen
2001-09-10 21:22 ` linux-2.4.10-pre5 Stephen C. Tweedie
2001-09-09 14:47 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 16:24 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 17:29 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-09 23:56 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-09 4:29 ` linux-2.4.10-pre5 Andreas Dilger
2001-09-09 4:54 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 6:17 ` linux-2.4.10-pre5 Andreas Dilger
2001-09-09 17:31 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 19:19 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-09 23:24 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-09 23:54 ` linux-2.4.10-pre5 Alan Cox
2001-09-10 0:04 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 0:23 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-10 0:23 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 0:38 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-10 1:04 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-10 1:45 ` linux-2.4.10-pre5 Chris Mason
2001-09-10 1:55 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-10 2:02 ` linux-2.4.10-pre5 Chris Mason
2001-09-10 2:06 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-10 2:15 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 2:22 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 2:20 ` linux-2.4.10-pre5 Chris Mason
2001-09-10 2:40 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 3:02 ` linux-2.4.10-pre5 Chris Mason
2001-09-10 3:36 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 19:06 ` linux-2.4.10-pre5 Chris Mason
2001-09-10 2:03 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-10 2:41 ` linux-2.4.10-pre5 Chris Mason
2001-09-10 21:18 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 21:23 ` linux-2.4.10-pre5 Alex Bligh - linux-kernel
2001-09-10 21:54 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 22:39 ` linux-2.4.10-pre5 Alex Bligh - linux-kernel
2001-09-10 23:13 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 23:25 ` linux-2.4.10-pre5 Alex Bligh - linux-kernel
2001-09-10 22:15 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-10 22:26 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-10 22:39 ` linux-2.4.10-pre5 Rik van Riel
2001-09-10 23:14 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-10 23:16 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-11 0:53 ` linux-2.4.10-pre5 Rik van Riel
2001-09-11 6:39 ` linux-2.4.10-pre5 Hua Zhong
2001-09-11 15:12 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-11 15:44 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-11 15:48 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-11 16:05 ` linux-2.4.10-pre5 Alex Bligh - linux-kernel
2001-09-11 16:07 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-11 16:07 ` linux-2.4.10-pre5 Alex Bligh - linux-kernel
2001-09-11 16:13 ` Martin Dalecki [this message]
2001-09-11 17:17 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-11 10:02 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-11 20:07 ` linux-2.4.10-pre5 Rik van Riel
2001-09-10 23:20 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-11 0:20 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-11 1:16 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-11 2:27 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-11 7:45 ` linux-2.4.10-pre5 Helge Hafting
2001-09-11 10:27 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-11 15:39 ` linux-2.4.10-pre5 Linus Torvalds
2001-09-11 16:52 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-09 19:51 ` linux-2.4.10-pre5 Daniel Phillips
2001-09-09 9:05 ` linux-2.4.10-pre5 Christoph Hellwig
2001-09-09 13:14 ` linux-2.4.10-pre5 Anton Altaparmakov
2001-09-09 14:31 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-08 21:15 ` linux-2.4.10-pre5 Andreas Dilger
2001-09-09 0:59 ` linux-2.4.10-pre5 Andrea Arcangeli
2001-09-08 22:01 ` linux-2.4.10-pre5 Thiago Vinhas de Moraes
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