From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta12.messagelabs.com (mail6.bemta12.messagelabs.com [216.82.250.247]) by kanga.kvack.org (Postfix) with ESMTP id B221C6B016A for ; Thu, 25 Aug 2011 22:54:41 -0400 (EDT) Message-ID: <4E570AEB.1040703@profihost.ag> Date: Fri, 26 Aug 2011 04:54:35 +0200 From: Stefan Priebe - Profihost AG MIME-Version: 1.0 Subject: Re: slow performance on disk/network i/o full speed after drop_caches References: <4E5494D4.1050605@profihost.ag> <4E54BDCF.9020504@profihost.ag> <20110824093336.GB5214@localhost> <4E560F2A.1030801@profihost.ag> <20110826021648.GA19529@localhost> In-Reply-To: <20110826021648.GA19529@localhost> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Wu Fengguang Cc: Pekka Enberg , LKML , "linux-mm@kvack.org" , Andrew Morton , Mel Gorman , Jens Axboe , Linux Netdev List Hi Wu, > Ah you are running an older kernel that didn't show all the vmstat > numbers. But still it's revealing that node 0 is used heavily and node > 1 is almost idle. So I won't be surprised to see most free pages lie > in node 1. I'm running a 2.6.38 kernel. There is at least a numastat proc file. grep . /sys/devices/system/node/node*/numastat /sys/devices/system/node/node0/numastat:numa_hit 5958586 /sys/devices/system/node/node0/numastat:numa_miss 0 /sys/devices/system/node/node0/numastat:numa_foreign 0 /sys/devices/system/node/node0/numastat:interleave_hit 4191 /sys/devices/system/node/node0/numastat:local_node 5885189 /sys/devices/system/node/node0/numastat:other_node 73397 /sys/devices/system/node/node1/numastat:numa_hit 488922 /sys/devices/system/node/node1/numastat:numa_miss 0 /sys/devices/system/node/node1/numastat:numa_foreign 0 /sys/devices/system/node/node1/numastat:interleave_hit 4187 /sys/devices/system/node/node1/numastat:local_node 386741 /sys/devices/system/node/node1/numastat:other_node 102181 >> modified it a little bit: >> ~# while [ true ]; do ps -eo >> user,pid,tid,class,rtprio,ni,pri,psr,pcpu,vsz,rss,pmem,stat,wchan:28,cmd >> | grep scp | grep -v grep; sleep 1; done >> >> root 12409 12409 TS - 0 19 0 59.8 42136 1724 0.0 Ss >> poll_schedule_timeout scp -t /tmp/ > > It's mostly doing poll() waits. There must be some dependency on > something other to make progress. Would you post the full ps output > for all tasks, and even better, run complete ps output: http://pastebin.com/raw.php?i=b948svzN > echo t> /proc/sysrq-trigger sadly i wa sonly able to grab the output in this crazy format: http://pastebin.com/raw.php?i=MBXvvyH1 Hope that still helps. Thanks Stefan -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org