Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760313Ab3DKWeT (ORCPT ); Thu, 11 Apr 2013 18:34:19 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:39571 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759089Ab3DKWeD (ORCPT ); Thu, 11 Apr 2013 18:34:03 -0400 Date: Thu, 11 Apr 2013 15:34:02 -0700 From: Andrew Morton To: Paul Clements Cc: , Subject: Re: [PATCH] nbd: increase default and max request sizes Message-Id: <20130411153402.12cfa2ad0c4501be1331e748@linux-foundation.org> In-Reply-To: <20130402194120.54043222C0@clements> References: <20130402194120.54043222C0@clements> X-Mailer: Sylpheed 3.2.0beta5 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1137 Lines: 29 On Tue, 2 Apr 2013 15:41:20 -0400 (EDT) Paul Clements wrote: > This patch raises the default max request size for nbd to 128KB (from 127KB) > to get it 4KB aligned. This patch also allows the max request size to be > increased (via /sys/block/nbd/queue/max_sectors_kb) to 32MB. > > The patch makes nbd network traffic more efficient by: > - reducing request fragmentation (4KB alignment) > - reducing the number of requests (fewer round trips, less network overhead) > > Especially in high latency networks, larger request size can make a dramatic > difference in performance. > > From: Michal Belczyk > Signed-off-by: Paul Clements This is a bit odd. - The author's "From:" line shouild appear right at the start of the changelog. - Michal's Signed-off-by: is absent. Is one available? Thanks. -- 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/