Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756627AbZFMFv0 (ORCPT ); Sat, 13 Jun 2009 01:51:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752413AbZFMFvS (ORCPT ); Sat, 13 Jun 2009 01:51:18 -0400 Received: from wf-out-1314.google.com ([209.85.200.171]:63596 "EHLO wf-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752070AbZFMFvR convert rfc822-to-8bit (ORCPT ); Sat, 13 Jun 2009 01:51:17 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=WdWZHvGD9P03J55/n15Dyedu+KN4aPKwjXEabwpI57ZEu/316SFupOAkxg/Pfn8CdJ MwyzKTXIvd32mPnjQ09COHn4w3OQvsCxurECZplC4tY8qwRcqt1VPGmo1vjmS65fqfAk gjttNqWqssCAk1vl84bKN/+ewqvYvcxMGftOs= MIME-Version: 1.0 In-Reply-To: <20090612212414.1ae5a284@infradead.org> References: <9b1675090904041103v477913a5of06fa5c10ebee05f@mail.gmail.com> <9b1675090904042117k77463227y66a872d52d027e7e@mail.gmail.com> <9b1675090904042125g708076e6v665f5ecc7fa020a4@mail.gmail.com> <9b1675090904042313rb8178b6v1da3aeddfa57a869@mail.gmail.com> <20090405062626.GA7760@mit.edu> <9b1675090904051542o42a0ca11y1ce3b691ed6d8ebb@mail.gmail.com> <9b1675090906062014h2ce44d8apc50f73aa036d9139@mail.gmail.com> <20090611191152.GD16787@mit.edu> <9b1675090906122048o35698c09x13cc7cf7650ac9ae@mail.gmail.com> <20090612212414.1ae5a284@infradead.org> Date: Fri, 12 Jun 2009 23:51:19 -0600 Message-ID: <9b1675090906122251y43476b23wd3593927e3b792c2@mail.gmail.com> Subject: Re: IO latency - a special case From: "Trenton D. Adams" To: Arjan van de Ven Cc: Theodore Tso , Linux Kernel Mailing List Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2173 Lines: 42 On Fri, Jun 12, 2009 at 10:24 PM, Arjan van de Ven wrote: > On Fri, 12 Jun 2009 21:48:41 -0600 > "Trenton D. Adams" wrote: > >> Sorry I didn't reply earlier. ?I got busy with some server troubles >> and such. >> > What sort of process where you typicalling trying to kill using ^C? >> >> It's maven, which spawns javac (java compiler), as well as does >> various other tasks such as making connections to the Internet, local >> directories, etc. > > I assume you know latencytop and how it might be useful to diagnose > such delays ? Your assumption would be incorrect. ;) Never heard of it before now. But, I did have it installed for some reason. However, when this starts happening, it's dang near impossible to do anything on the machine. I wouldn't be able to run it if I tried, though I will try :D. I barely have enough time to Ctrl-C before the machines locks for about 3600 seconds. And during that time (around 10-30 seconds), I can't really switch applications, as the latency is so high. Right now, just during normal system usage, it's showing... Cause Maximum Percentage poll_schedule_timeout do_sys_poll sys_poll sysente 5.0 msec 58.0 % futex_wait do_futex compat_sys_futex sysenter_disp 5.0 msec 40.3 % blk_execute_rq scsi_execute scsi_execute_req scsi_ 3.9 msec 0.2 % blk_execute_rq scsi_execute scsi_execute_req sd_re 3.5 msec 0.2 % poll_schedule_timeout do_select core_sys_select sy 3.4 msec 0.3 % blk_execute_rq scsi_execute scsi_execute_req sr_te 2.6 msec 0.5 % blk_execute_rq scsi_execute scsi_execute_req sr_te 2.2 msec 0.5 % blk_execute_rq scsi_execute sr_do_ioctl sr_packet 0.9 msec 0.1 % blk_execute_rq scsi_execute scsi_execute_req ioctl 0.6 msec 0.0 % release __blkdev_put blkdev_put blkdev_close __fput -- 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/