From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Jeff Garzik <jeff@garzik.org>
Subject: Re: sata badness in 2.6.20-rc1? [Was: Re: md patches in -mm]
Date: Fri, 15 Dec 2006 23:27:24 +0100
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Cc: Alan <alan@lxorguk.ukuu.org.uk>, Andrew Morton <akpm@osdl.org>,
       Neil Brown <neilb@suse.de>, Jurriaan <thunder7@xs4all.nl>,
       linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
       Tejun Heo <htejun@gmail.com>
References: <20061204203410.6152efec.akpm@osdl.org> <20061215220618.06f1873c@localhost.localdomain> <45831F80.5060008@garzik.org>
In-Reply-To: <45831F80.5060008@garzik.org>
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On Friday, 15 December 2006 23:19, Jeff Garzik wrote:
> Alan wrote:
> > On Fri, 15 Dec 2006 13:39:27 -0800
> > Andrew Morton <akpm@osdl.org> wrote:
> > 
> >> On Fri, 15 Dec 2006 13:05:52 -0800
> >> Andrew Morton <akpm@osdl.org> wrote:
> >>
> >>> Jeff, I shall send all the sata patches which I have at you one single time
> >>> and I shall then drop the lot.  So please don't flub them.
> >>>
> >>> I'll then do a rc1-mm2 without them.
> >> hm, this is looking like a lot of work for not much gain.  Rafael, are
> >> you able to do a quick chop and tell us whether these:
> > 
> > The md one and the long history of reports about parallel I/O causing
> > problems sounds a lot more like the kmap stuff you were worried about
> > Andrew. I'd be very intereste dto know if it happens on x86_32 built with
> > a standard memory split and no highmem....
> 
> 2.6.20-rc1 works, and 2.6.20-rc1 does not have the kmap_atomic() fix.
> 
> Upstream does kmap_atomic(KM_USER0) and -mm does kmap_atomic(KM_IRQ0)

On x86_64 that shouldn't be a problem, I think, and my machine is an x86_64
one.

Greetings,
Rafael


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