Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261957AbVAHWdt (ORCPT ); Sat, 8 Jan 2005 17:33:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261913AbVAHWds (ORCPT ); Sat, 8 Jan 2005 17:33:48 -0500 Received: from x35.xmailserver.org ([69.30.125.51]:27586 "EHLO x35.xmailserver.org") by vger.kernel.org with ESMTP id S261957AbVAHWaA (ORCPT ); Sat, 8 Jan 2005 17:30:00 -0500 X-AuthUser: davidel@xmailserver.org Date: Sat, 8 Jan 2005 14:29:49 -0800 (PST) From: Davide Libenzi X-X-Sender: davide@bigblue.dev.mdolabs.com To: Linus Torvalds cc: Lee Revell , Chris Friesen , Mike Waychison , Alan Cox , Oleg Nesterov , William Lee Irwin III , Linux Kernel Mailing List Subject: Re: Make pipe data structure be a circular list of pages, rather than In-Reply-To: Message-ID: References: <41DE9D10.B33ED5E4@tv-sign.ru> <1105113998.24187.361.camel@localhost.localdomain> <41DEF81B.60905@sun.com> <41DF1F3D.3030006@nortelnetworks.com> <1105220326.24592.98.camel@krustophenia.net> X-GPG-FINGRPRINT: CFAE 5BEE FD36 F65E E640 56FE 0974 BF23 270F 474E X-GPG-PUBLIC_KEY: http://www.xmailserver.org/davidel.asc MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 780 Lines: 19 On Sat, 8 Jan 2005, Linus Torvalds wrote: > Short and sweet: the latency changes are in the noise for SMP, but can be > seen on UP. I'll look at it a bit more: since I had to add the coalescing > code anyway, I might also decide to re-use a buffer page rather than free > it immediately, since that may help latency for small writes. Yeah, I noticed you clean the page's magazine down to the bottom. Maybe keeping one (or more) page in there might help something, due to cache improvements and alloc/free page savings. - Davide - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/