Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261747AbTEUOCe (ORCPT ); Wed, 21 May 2003 10:02:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262115AbTEUOCe (ORCPT ); Wed, 21 May 2003 10:02:34 -0400 Received: from tag.witbe.net ([81.88.96.48]:776 "EHLO tag.witbe.net") by vger.kernel.org with ESMTP id S261747AbTEUOCd (ORCPT ); Wed, 21 May 2003 10:02:33 -0400 From: "Paul Rolland" To: "'Corey Minyard'" Cc: Subject: Re: e100 latency, cpu cycle saver and e1000... Date: Wed, 21 May 2003 16:15:35 +0200 Message-ID: <011a01c31fa3$725354e0$3f00a8c0@witbe> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 In-Reply-To: <3ECB87F5.8060808@acm.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1210 Lines: 32 Hello, > My little program was crude at best. Yes, I know, but it does exist ! > You have to take into account what the machines are doing. > If you notice, the "Min" latency is about the same, so it's > not a CPU cycle saver. The long "Max" latencies mean you > probably have something on IP2 that is blocking the execution > of the IP stack (for, say up to 4.5ms). > Are all the machine completely quiesced except for the test program? > Have you tried switching the network connections to see if it > is in the network hardware? Correct, machines are not idle... but - they are doing globally the same work, - this behavior is something I can reproduce test after test, since I've started this morning... I started using that because IP1 was exhibiting high latency yesterday 'til I rebooted it, and since it is working quite fine... Of course, I can reboot also IP2, but I'd like to understand why and how to avoid it later... Regards, Paul - 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/