From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: sata badness in 2.6.20-rc1? [Was: Re: md patches in -mm] Date: Fri, 15 Dec 2006 17:19:44 -0500 Message-ID: <45831F80.5060008@garzik.org> References: <20061204203410.6152efec.akpm@osdl.org> <17780.63770.228659.234534@cse.unsw.edu.au> <20061205061623.GA13749@amd64.of.nowhere> <20061205062142.GA14784@amd64.of.nowhere> <20061204224323.2e5d0494.akpm@osdl.org> <20061205105928.GA6482@amd64.of.nowhere> <17782.28505.303064.964551@cse.unsw.edu.au> <20061215192146.GA3616@amd64.of.nowhere> <17795.2681.523120.656367@cse.unsw.edu.au> <20061215130552.95860b72.akpm@osdl.org> <20061215133927.a8346372.akpm@osdl.org> <20061215220618.06f1873c@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20061215220618.06f1873c@localhost.localdomain> Sender: linux-raid-owner@vger.kernel.org To: Alan Cc: Andrew Morton , Neil Brown , Jurriaan , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, Tejun Heo List-Id: linux-raid.ids Alan wrote: > On Fri, 15 Dec 2006 13:39:27 -0800 > Andrew Morton wrote: > >> On Fri, 15 Dec 2006 13:05:52 -0800 >> Andrew Morton 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