From: Jens Axboe <axboe@suse.de>
To: Steve Lord <lord@sgi.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: SCSI I/O performance problems when CONFIG_HIGHIO is off
Date: Sat, 16 Nov 2002 09:18:28 +0100 [thread overview]
Message-ID: <20021116081828.GB8495@suse.de> (raw)
In-Reply-To: <1037392310.13531.419.camel@jen.americas.sgi.com>
On Fri, Nov 15 2002, Steve Lord wrote:
> Jens,
>
> As you know, for the last week or so I have been battling some
> performance issues in XFS and 2.4.20-rc1. Well, we finally found
> the culprit back in 2.4.20-pre2.
>
> When the block highmem patch was included, it added highmem_io to the
> scsi controller structure. This can only ever be set to one if
> CONFIG_HIGHIO is set. Yet there are several spots in the scsi
> code which test based on its value regardless.
Doh! You are right, this is a very stupid bug, thanks for catching it.
I'm on the road this weekend, I'' submit a patch to fix it as soon
as I get back.
> Jens, can you do something about this please?
Of course
> p.s. You now owe me a week's consulting some time ;-)
Indeed, sorry about that...
Jens
next prev parent reply other threads:[~2002-11-16 8:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-15 20:31 SCSI I/O performance problems when CONFIG_HIGHIO is off Steve Lord
2002-11-16 8:18 ` Jens Axboe [this message]
2002-11-18 12:05 ` Jens Axboe
2002-11-18 14:05 ` Stephen Lord
2002-11-18 14:12 ` Jens Axboe
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