Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756157AbYAJVan (ORCPT ); Thu, 10 Jan 2008 16:30:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752935AbYAJVae (ORCPT ); Thu, 10 Jan 2008 16:30:34 -0500 Received: from zrtps0kn.nortel.com ([47.140.192.55]:52577 "EHLO zrtps0kn.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752463AbYAJVac (ORCPT ); Thu, 10 Jan 2008 16:30:32 -0500 Message-ID: <47868E28.1070600@nortel.com> Date: Thu, 10 Jan 2008 15:29:12 -0600 From: "Chris Friesen" User-Agent: Mozilla Thunderbird 1.0.2-6 (X11/20050513) X-Accept-Language: en-us, en MIME-Version: 1.0 To: James Chapman CC: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: questions on NAPI processing latency and dropped network packets References: <478654C3.60806@nortel.com> <47866327.8090905@katalix.com> In-Reply-To: <47866327.8090905@katalix.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 10 Jan 2008 21:29:15.0559 (UTC) FILETIME=[D9B01370:01C853CF] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 890 Lines: 24 James Chapman wrote: > What's changed in your application? Any real-time threads in there? > >>From the top output below, looks like SigtranServices is consuming all > your CPU... There are two cpus, and SigtranServices is multithreaded with many threads. Most of these threads are affined to cpu0, a couple to cpu1. None of the threads are realtime. Top is showing 37% idle on cpu0, and 6% idle on cpu1, so not all the cpu is being consumed. However, I'm wondering if we're hitting bursty bits and we're just running out of time. I'm going to try a system with MAX_SOFTIRQ_RESTART bumped up a bit, and also enable profiling. Chris -- 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/