Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754039AbXJAIfY (ORCPT ); Mon, 1 Oct 2007 04:35:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752149AbXJAIfJ (ORCPT ); Mon, 1 Oct 2007 04:35:09 -0400 Received: from smtp23.orange.fr ([80.12.242.50]:19039 "EHLO smtp23.orange.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751892AbXJAIfI convert rfc822-to-8bit (ORCPT ); Mon, 1 Oct 2007 04:35:08 -0400 X-ME-UUID: 20071001083506468.7278C1C00090@mwinf2303.orange.fr Message-ID: <4700B136.8050109@cosmosbay.com> Date: Mon, 01 Oct 2007 10:35:02 +0200 From: Eric Dumazet User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) MIME-Version: 1.0 Cc: Denys , David Miller , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: 2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression References: <200709301425.37564.nickpiggin@yahoo.com.au> <20070930223503.M8966@nuclearcat.com> <47008CB0.7010808@cosmosbay.com> <20071001.001259.28812610.davem@davemloft.net> <20071001080339.M21850@nuclearcat.com> <4700ADB7.7050102@cosmosbay.com> In-Reply-To: <4700ADB7.7050102@cosmosbay.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8BIT To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1436 Lines: 43 Eric Dumazet a écrit : > Denys a écrit : >> Well, i can play a bit more on "live" servers. I have now hot-swap >> server with >> full gentoo, where i can rebuild any kernel you want, with any >> applied patch. >> But it looks more like not overhead, load becoming high too "spiky", >> and it is >> not just permantenly higher. Also it is not normal that all system >> becoming >> unresposive (for example ping 127.0.0.1 becoming 300ms for period, >> when usage >> softirq jumps to 100%). >> >> > Could you try a pristine 2.6.22.9 and some patch in > secure_tcp_sequence_number() like : > > --- drivers/char/random.c.orig 2007-10-01 10:18:42.000000000 +0200 > +++ drivers/char/random.c 2007-10-01 10:19:58.000000000 +0200 > @@ -1554,7 +1554,7 @@ > * That's funny, Linux has one built in! Use it! > * (Networks are faster now - should this be increased?) > */ > - seq += ktime_get_real().tv64; > + seq += ktime_get_real().tv64 / 1000; > #if 0 > printk("init_seq(%lx, %lx, %d, %d) = %d\n", > saddr, daddr, sport, dport, seq); On 32 bits machine, replace the divide by a shift to avoid a linker error (undefined reference to `__divdi3'): seq += ktime_get_real().tv64 >> 10; - 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/