From: Timothy Miller <miller@techsource.com>
To: Markus Schaber <schabios@logi-track.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Block Device Caching
Date: Tue, 29 Jun 2004 19:40:28 -0400 [thread overview]
Message-ID: <40E1FDEC.6020606@techsource.com> (raw)
In-Reply-To: <20040630002014.4970b82d@kingfisher.intern.logi-track.com>
Markus Schaber wrote:
> This lead us to the conclusion that block devices do not cache, but the
> filesystem does. But subsequently, I ran some tests on my developer
> machine (Pentium 4 Mobile Laptop).
I had kernel experts repeatedly insist to me that block devices were
cached, while all of my tests (using dd to or from, say, /dev/sda1 or
whatever) indicated that there was absolutely no caching whatsoever.
In my experience, reads and writes to block devices are uncached, while
filesystem stuff IS cached.
next prev parent reply other threads:[~2004-06-29 23:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-29 22:20 Block Device Caching Markus Schaber
2004-06-29 22:46 ` Andreas Dilger
2004-06-29 23:41 ` Timothy Miller
2004-06-30 6:30 ` Markus Schaber
2004-07-02 9:21 ` CCISS driver and Caching (was: Block Device Caching) Markus Schaber
2004-06-29 23:40 ` Timothy Miller [this message]
2004-06-30 8:29 ` Block Device Caching Helge Hafting
[not found] ` <20040630123828.7d48c6e6@kingfisher.intern.logi-track.com>
[not found] ` <40E543D7.9030303@hist.no>
2004-07-02 12:01 ` Markus Schaber
2004-07-02 12:56 ` FabF
2004-07-05 15:07 ` Markus Schaber
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