From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yh0-f52.google.com (mail-yh0-f52.google.com [209.85.213.52]) by kanga.kvack.org (Postfix) with ESMTP id AB8A66B0035 for ; Wed, 22 Jan 2014 15:57:14 -0500 (EST) Received: by mail-yh0-f52.google.com with SMTP id v1so364874yhn.25 for ; Wed, 22 Jan 2014 12:57:14 -0800 (PST) Received: from aserp1040.oracle.com (aserp1040.oracle.com. [141.146.126.69]) by mx.google.com with ESMTPS id s6si719866yho.114.2014.01.22.12.57.12 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 22 Jan 2014 12:57:13 -0800 (PST) Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes From: "Martin K. Petersen" References: <20131220093022.GV11295@suse.de> <52DF353D.6050300@redhat.com> <20140122093435.GS4963@suse.de> <52DFD168.8080001@redhat.com> <20140122143452.GW4963@suse.de> <52DFDCA6.1050204@redhat.com> <20140122151913.GY4963@suse.de> <1390410233.1198.7.camel@ret.masoncoding.com> <1390411300.2372.33.camel@dabdike.int.hansenpartnership.com> <1390413819.1198.20.camel@ret.masoncoding.com> <1390414439.2372.53.camel@dabdike.int.hansenpartnership.com> <52E00B28.3060609@redhat.com> <1390415703.2372.62.camel@dabdike.int.hansenpartnership.com> <52E0106B.5010604@redhat.com> <1390419019.2372.89.camel@dabdike.int.hansenpartnership.com> Date: Wed, 22 Jan 2014 15:57:01 -0500 In-Reply-To: <1390419019.2372.89.camel@dabdike.int.hansenpartnership.com> (James Bottomley's message of "Wed, 22 Jan 2014 11:30:19 -0800") Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: James Bottomley Cc: Ric Wheeler , "linux-scsi@vger.kernel.org" , "linux-ide@vger.kernel.org" , Chris Mason , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "mgorman@suse.de" , "linux-fsdevel@vger.kernel.org" , "akpm@linux-foundation.org" , "lsf-pc@lists.linux-foundation.org" >>>>> "James" == James Bottomley writes: >> or even (not today, but some day) reject the IO. James> I really doubt this. All 4k drives today do RMW ... I don't see James> that changing any time soon. All consumer grade 4K phys drives do RMW. It's a different story for enterprise drives. The vendors appear to be divided between 4Kn and 512e with RMW mitigation. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org