From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932119AbVHWLKH (ORCPT ); Tue, 23 Aug 2005 07:10:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932122AbVHWLKH (ORCPT ); Tue, 23 Aug 2005 07:10:07 -0400 Received: from wproxy.gmail.com ([64.233.184.195]:48617 "EHLO wproxy.gmail.com") by vger.kernel.org with ESMTP id S932119AbVHWLKG (ORCPT ); Tue, 23 Aug 2005 07:10:06 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:user-agent:x-accept-language:mime-version:to:subject:content-type:content-transfer-encoding; b=jOAG9MnWYTJe+TBTNlZ43sRJrDUxSuxcQU3XPz936fKk+ok/IHLO/YupvJl8spxahjoO71sRGzicdTKFzmVL2uIAF1KRs2pScdHt5e6vAuGepODTg0XMx/1k04Mdsiu/dv4OsOFHiqf/I/Lw8pOi1m3PeB7LfcTq9on2yH/vfWw= Message-ID: <430B03B4.8040205@gmail.com> Date: Tue, 23 Aug 2005 16:38:36 +0530 From: Rajesh User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050716) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: debug a high load average Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi All: I have a case occasionally when I copy data from a usb storage (ipod) to my hard drive the load average goes up from 0.4 to about 15.0, and the system becomes very unusable till I kill the cp command. I have checked the CPU usage, bytes read from usb device, byte written to hard drive etc, and all these values are low like CPU usage is at a maximum of 30%, disk read bytes is at an average of 1.5 MiB/s, disk write bytes is at 1.5 MiB/s, number of processes is at 110, etc, during this high load. So my question is what else determines the high load average that in turn is resulting in the unresponsiveness of the system? What else should I be looking for to debug the problem? Thanks a lot, Rajesh