linux-kernel - Re: sata badness in 2.6.20-rc1? [Was: Re: md patches in -mm]

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Date:	Fri, 15 Dec 2006 17:19:44 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	Andrew Morton <akpm@...l.org>, Neil Brown <neilb@...e.de>,
	Jurriaan <thunder7@...all.nl>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, Tejun Heo <htejun@...il.com>
Subject: Re: sata badness in 2.6.20-rc1? [Was: Re: md patches in -mm]

Alan wrote:
> On Fri, 15 Dec 2006 13:39:27 -0800
> Andrew Morton <akpm@...l.org> wrote:
> 
>> On Fri, 15 Dec 2006 13:05:52 -0800
>> Andrew Morton <akpm@...l.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)

	Jeff



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