Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751922AbWIRVI4 (ORCPT ); Mon, 18 Sep 2006 17:08:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751920AbWIRVIz (ORCPT ); Mon, 18 Sep 2006 17:08:55 -0400 Received: from tentacle.snto-msu.net ([194.88.210.4]:27117 "EHLO tentacle.sectorb.msk.ru") by vger.kernel.org with ESMTP id S1751183AbWIRVIy (ORCPT ); Mon, 18 Sep 2006 17:08:54 -0400 Date: Tue, 19 Sep 2006 01:08:49 +0400 From: "Vladimir B. Savkin" To: Andi Kleen Cc: Jesper Dangaard Brouer , Harry Edmon , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Andi Kleen Subject: Re: Network performance degradation from 2.6.11.12 to 2.6.16.20 Message-ID: <20060918210849.GA31746@tentacle.sectorb.msk.ru> References: <4492D5D3.4000303@atmos.washington.edu> <44948EF6.1060201@atmos.washington.edu> <200606191724.31305.ak@suse.de> <20060916120845.GA18912@tentacle.sectorb.msk.ru> <20060918090330.GA9850@tentacle.sectorb.msk.ru> <20060918102918.GA23261@tentacle.sectorb.msk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Disposition: inline In-Reply-To: X-Organization: Moscow State Univ., Institute of Mechanics X-Operating-System: Linux 2.6.17-rc6-64 User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1349 Lines: 34 On Mon, Sep 18, 2006 at 01:27:57PM +0200, Andi Kleen wrote: > The codebase for timing (and lots of other things) is quite different > between 32bit and 64bit. You're really surprised it doesn't work if you do such things? > It works, and after your remark above, I'm surprised. Dunno about slow TSC drift though, there was not enough time passed to detect it, and I hope we will have this problem soved in a better way before the drift becomes visible :) > > But the question is, why stock 2.6.18-rc7 could not use TSC on its own? > > x86-64 doesn't use the TSC when it deems it to not be reliable, which > is the case on your system. > Could it at least print something so that I know that using TSC was considered, but rejected? > > What hardware exactly. Doesn't it affect only CPU? And they are not > > know to fail before any other components. > > All hardware. It's basic physics. Hm, what other hardware is affected by idle=poll? Does this option ear out HDDs? ~ :wq With best regards, Vladimir Savkin. - 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/