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Date: Thu, 25 Aug 2011 11:00:26 +0200 From: Stefan Priebe - Profihost AG <s.priebe@...fihost.ag> To: Wu Fengguang <fengguang.wu@...el.com> CC: Pekka Enberg <penberg@...nel.org>, LKML <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mel@....ul.ie>, Jens Axboe <jaxboe@...ionio.com>, Linux Netdev List <netdev@...r.kernel.org> Subject: Re: slow performance on disk/network i/o full speed after drop_caches Am 24.08.2011 11:33, schrieb Wu Fengguang: > On Wed, Aug 24, 2011 at 05:01:03PM +0800, Stefan Priebe - Profihost AG wrote: >> >>>> sync&& echo 3>/proc/sys/vm/drop_caches&& sleep 2&& echo 0 >>>>> /proc/sys/vm/drop_caches >> >> Another way to get it working again is to stop some processes. Could be >> mysql or apache or php fcgi doesn't matter. Just free some memory. >> Although there are already 5GB free. > > Is it a NUMA machine and _every_ node has enough free pages? > > grep . /sys/devices/system/node/node*/vmstat > > Thanks, > Fengguang Hi Fengguang, thanks for your fast reply. Here is the data you requested: root@...ver1015-han:~# grep . /sys/devices/system/node/node*/vmstat /sys/devices/system/node/node0/vmstat:nr_written 5546561 /sys/devices/system/node/node0/vmstat:nr_dirtied 5572497 /sys/devices/system/node/node1/vmstat:nr_written 3936 /sys/devices/system/node/node1/vmstat:nr_dirtied 4190 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/ root 12409 12409 TS - 0 19 0 64.0 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 0 67.7 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 8 70.6 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 8 73.5 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 8 76.0 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 8 78.2 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 8 80.0 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 8 80.9 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 2 76.7 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 75.6 42136 1724 0.0 Ds pipe_read scp -t /tmp/ root 12409 12409 TS - 0 19 0 76.0 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 1 75.2 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 1 76.6 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 1 77.9 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 1 79.0 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 72.8 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 0 73.0 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 0 73.8 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 74.3 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 73.4 42136 1724 0.0 Ss - scp -t /tmp/ root 12409 12409 TS - 0 19 1 71.3 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 71.9 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 0 72.7 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 3 73.5 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 3 74.4 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 3 75.2 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 0 76.0 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 8 76.6 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 74.8 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 73.2 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 1 73.9 42136 1724 0.0 Rs poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 0 72.4 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 8 72.0 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 8 72.5 42136 1724 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12409 12409 TS - 0 19 8 72.9 42136 1724 0.0 Rs - scp -t /tmp/ root 12409 12409 TS - 0 19 8 73.5 42136 1724 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 1 0.0 42136 1728 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 1 23.0 42136 1728 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 1 49.5 42136 1728 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 2 63.3 42136 1728 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 1 71.5 42136 1728 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 1 77.4 42136 1728 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 1 70.3 42136 1728 0.0 Rs - scp -t /tmp/ root 12566 12566 TS - 0 19 1 73.1 42136 1728 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12566 12566 TS - 0 19 0 65.7 42136 1728 0.0 Ss poll_schedule_timeout scp -t /tmp/ root 12566 12566 TS - 0 19 1 61.2 42136 1728 0.0 Ss - scp -t /tmp/ root 12566 12566 TS - 0 19 1 63.7 42136 1728 0.0 Rs - scp -t /tmp/ root 12636 12636 TS - 0 19 8 0.0 42136 1728 0.0 Ss poll_schedule_timeout scp -t /tmp/ Stefan -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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