From: Mark Lord Subject: Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super_operation Date: Fri, 19 Nov 2010 10:21:35 -0500 Message-ID: <4CE695FF.20601@teksavvy.com> References: <1290065809-3976-1-git-send-email-lczerner@redhat.com> <20101118130630.GJ6178@parisc-linux.org> <20101118134804.GN5618@dhcp231-156.rdu.redhat.com> <20101118141957.GK6178@parisc-linux.org> <20101118142918.GA18510@infradead.org> <1290100750.3041.72.camel@mulgrave.site> <4CE59C9E.6050902@teksavvy.com> <1290177488-sup-6540@think> <4CE68F80.7000607@teksavvy.com> <20101119145748.GB27919@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Chris Mason , James Bottomley , Matthew Wilcox , Josef Bacik , Lukas Czerner , tytso , linux-ext4 , linux-kernel , linux-fsdevel , sandeen To: Christoph Hellwig Return-path: Received: from ironport2-out.teksavvy.com ([206.248.154.181]:44305 "EHLO ironport2-out.pppoe.ca" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754778Ab0KSPVh (ORCPT ); Fri, 19 Nov 2010 10:21:37 -0500 In-Reply-To: <20101119145748.GB27919@infradead.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On 10-11-19 09:57 AM, Christoph Hellwig wrote: > On Fri, Nov 19, 2010 at 09:53:52AM -0500, Mark Lord wrote: >> On 10-11-19 09:40 AM, Chris Mason wrote: >>> >>> We've been told that online and constant trimming is the default in >>> windows7. The ssds are most likely to just start ignoring the trims >>> they can't service efficiently. >> >> Win7 collects multiple TRIM ranges over time and batches them as single TRIMs >> (as reported to me by an SSD vendor who traced it with a SATA analyzer, >> and who also apparently has "inside info"). > > I really hate to rely on this third party hearsay (from all sides), and > have implement TRIM support in qemu now. I'll soon install win7 and > will check out the TRIM patters myself. Excellent!