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Date: Fri, 26 Aug 2011 04:54:35 +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 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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