From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH 1/2 V2] kvm tools: Add scatter-gather variants of IO functions Date: Sun, 17 Apr 2011 15:49:45 +0300 Message-ID: <4DAAE1E9.8000502@redhat.com> References: <1302966356-13145-1-git-send-email-levinsasha928@gmail.com> <4DA9E285.5040308@openvz.org> <4DAAB0A3.3020206@redhat.com> <4DAABAF2.1020700@parallels.com> <1303035738.3017.5.camel@stimpy> <4DAAC252.8050703@parallels.com> <1303038717.3017.18.camel@stimpy> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Konstantin Khlebnikov , "penberg@kernel.org" , "mingo@elte.hu" , "asias.hejun@gmail.com" , "gorcunov@gmail.com" , "kvm@vger.kernel.org" To: Sasha Levin Return-path: Received: from mx1.redhat.com ([209.132.183.28]:13495 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750803Ab1DQMuI (ORCPT ); Sun, 17 Apr 2011 08:50:08 -0400 In-Reply-To: <1303038717.3017.18.camel@stimpy> Sender: kvm-owner@vger.kernel.org List-ID: On 04/17/2011 02:11 PM, Sasha Levin wrote: > I don't think it's worth delaying the next readv() to run through > read_in_full, and whats more, the part we're going to read again is > probably sitting in the file cache anyway. If you have a file cache. High performance often means bypassing the cache, and in those cases submitting guest requests exactly as the guest passed them is important. -- error compiling committee.c: too many arguments to function