From: Olaf Hering <olh@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: very low performance on SCSI disks if device node is in tmpfs
Date: Wed, 26 May 2004 11:53:51 +0200 [thread overview]
Message-ID: <20040526095351.GC28430@suse.de> (raw)
In-Reply-To: <20040525154107.053b9ef6.akpm@osdl.org>
On Tue, May 25, Andrew Morton wrote:
> Andrew Morton <akpm@osdl.org> wrote:
> >
> > Everything there is consistent with "not doing readahead".
> >
>
>
>
> We need to set file->f_ra _after_ calling blkdev_open(), when inode->i_mapping
> points at the right thing. And we need to get it from
> inode->i_mapping->host->i_mapping too, which represents the underlying device.
That fixed it, thanks for the patch and the award!
I will take the patch and pass the award to the guy who found the bug.
--
USB is for mice, FireWire is for men!
sUse lINUX ag, nÜRNBERG
prev parent reply other threads:[~2004-05-26 9:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-25 18:47 very low performance on SCSI disks if device node is in tmpfs 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
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 [this message]
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