Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261875AbUDIGry (ORCPT ); Fri, 9 Apr 2004 02:47:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261862AbUDIGrx (ORCPT ); Fri, 9 Apr 2004 02:47:53 -0400 Received: from 168.imtp.Ilyichevsk.Odessa.UA ([195.66.192.168]:40975 "HELO port.imtp.ilyichevsk.odessa.ua") by vger.kernel.org with SMTP id S261875AbUDIGrw convert rfc822-to-8bit (ORCPT ); Fri, 9 Apr 2004 02:47:52 -0400 Content-Type: text/plain; charset="iso-8859-1" From: Denis Vlasenko To: Sven =?iso-8859-1?q?K=F6hler?= , linux-kernel@vger.kernel.org Subject: Re: cat /dev/hdb > /dev/null DoS Date: Fri, 9 Apr 2004 09:47:38 +0300 X-Mailer: KMail [version 1.4] References: <20040408085518.B4607@beton.cybernet.src> In-Reply-To: MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT Message-Id: <200404090947.39069.vda@port.imtp.ilyichevsk.odessa.ua> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1253 Lines: 29 On Friday 09 April 2004 03:10, Sven K?hler wrote: > > i guess you have DMA enabled on /dev/hdb. I would expect, that the > > system is at least 50% idle > > i did > dd if=/dev/hda of=/dev/null bs=1M > and noticed, that top shows 0% idle, but 95% wa - what ever that means. > > Since i've got DMA turned on, i would expect the CPU to be 95% idle, > instead 95% wa? what does "wa" stand for? top version? Mine is 2.0.18, looks like this: 09:47:25 up 1 day, 17:07, 2 users, load average: 0.42, 0.27, 0.24 116 processes: 114 sleeping, 2 running, 0 zombie, 0 stopped CPU states: 4.2% user 52.1% system 0.0% nice 43.6% iowait 0.0% idle Mem: 122736k av, 121088k used, 1648k free, 0k shrd, 22968k buff 76324k active, 21000k inactive Swap: 76792k av, 67004k used, 9788k free 25748k cached PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND 15022 root 18 0 2280 1460 1200 R 38.6 1.1 0:05 0 dd -- vda - 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/