[6264] in linux-scsi channel archive
Re: how to get maximum datarate from SCSI
daemon@ATHENA.MIT.EDU (Stephen C. Tweedie)
Tue Apr 6 11:31:05 1999
From: "Stephen C. Tweedie" <sct@redhat.com>
Date: Tue, 6 Apr 1999 14:36:19 +0100 (BST)
To: dstein2203@t-online.de (Dietmar Stein)
Cc: "Stephen C. Tweedie" <sct@redhat.com>, linux-scsi@vger.rutgers.edu
In-Reply-To: <3703AF64.18827525@t-online.de>
Hi,
On Thu, 01 Apr 1999 19:39:49 +0200, dstein2203@t-online.de (Dietmar
Stein) said:
> now I got the same problem as the guy I answered a few days ago - is
> there any possibility to switch off cache for filesystem and devices
> under linux except the sync-option?
sync IO does not turn off caching. Ever. Raw/direct IO will bypass the
cache entirely, but all IO to/from normal block device will always go
through the buffer cache, and all ext2 IO right now is guaranteed to use
either the page cache (reads and mmap) or the buffer cache (writes).
--Stephen
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