Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264484AbUDSPCD (ORCPT ); Mon, 19 Apr 2004 11:02:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264453AbUDSPCD (ORCPT ); Mon, 19 Apr 2004 11:02:03 -0400 Received: from bay14-f33.bay14.hotmail.com ([64.4.49.33]:29700 "EHLO hotmail.com") by vger.kernel.org with ESMTP id S264494AbUDSPBn (ORCPT ); Mon, 19 Apr 2004 11:01:43 -0400 X-Originating-IP: [212.143.127.195] X-Originating-Email: [qwejohn@hotmail.com] From: "John Que" To: bart@samwel.tk Cc: linux-kernel@vger.kernel.org Subject: Re: NIC inerrupt Date: Mon, 19 Apr 2004 18:01:42 +0300 Mime-Version: 1.0 Content-Type: text/plain; format=flowed Message-ID: X-OriginalArrivalTime: 19 Apr 2004 15:01:42.0584 (UTC) FILETIME=[399FEB80:01C4261F] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1843 Lines: 55 Hello, thnxs; You are right in that I send about 4500-5000 packets in a second. I will try to print it every 1000 packets and see. john >From: Bart Samwel >To: John Que >CC: linux-kernel@vger.kernel.org >Subject: Re: NIC inerrupt >Date: Mon, 19 Apr 2004 16:40:08 +0200 > > > >John Que wrote: >>Hello, >> >>I want to count the number of times I reach an NIC receive >>interrupt. >> >>I added a global static variable of type int , and initialized >>it to 0 ; each time I am in the rx_interrupt of the card I incerement >>it by one; >>I got large , non sensible numbers after one or two seconds; >> >>So for debug I added printk each time I increment it in rx_interrupt. >> >>What I see is that there are unreasonable jumps in the number >> >>for instance , it inceremnts sequntially from 1 to 80,then jums to 4500, >>increments a little sequentially to 4580, and the jums again to >>11000 ; >> >>Is it got to do with it that this is in interrupt? >>Any idea what it can be ? > >You're probably reading the kernel output from syslog. Syslog periodically >reads out the printks from the kernel. With the amount of printks you're >doing you are probably printing info for about 4500 interrupts between >every time syslog checks for new kernel output, while the kernel buffer >that is used to store this information can only handle enough data for 80 >interrupts. > >--Bart _________________________________________________________________ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail - 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/