From: Oliver Neukum <oliver@neukum.org>
To: root@chaos.analogic.com
Cc: Olaf Hering <olh@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: very low performance on SCSI disks if device node is in tmpfs
Date: Tue, 25 May 2004 22:02:54 +0200 [thread overview]
Message-ID: <200405252202.54745.oliver@neukum.org> (raw)
In-Reply-To: <Pine.LNX.4.53.0405251540410.803@chaos>
Am Dienstag, 25. Mai 2004 21:44 schrieb Richard B. Johnson:
> On Tue, 25 May 2004, Olaf Hering wrote:
>
> > On Tue, May 25, Richard B. Johnson wrote unrelated stuff:
> >
>
> It is not unrelated stuff. If you think it is, you will
> come to an incorrect conclusion with your experiments.
> As I stated, you are not actually communicating with a
> device-file except for the initial open().
Exactly therefore the results are so extremely odd.
Either looking up a device node is very expensive, or we have an
unknown phenomenon.
Regards
Oliver
next prev parent reply other threads:[~2004-05-25 20:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-25 18:47 Olaf Hering
2004-05-25 19:14 ` Richard B. Johnson
2004-05-25 19:34 ` Olaf Hering
2004-05-25 19:44 ` Richard B. Johnson
2004-05-25 20:02 ` Oliver Neukum [this message]
2004-05-25 21:48 ` Andrew Morton
2004-05-25 21:57 ` Richard B. Johnson
2004-05-25 21:59 ` Andrew Morton
2004-05-25 22:41 ` Andrew Morton
2004-05-26 0:05 ` Linus Torvalds
2004-05-26 0:10 ` viro
2004-05-26 0:14 ` Andrew Morton
2004-05-26 9:53 ` Olaf Hering
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