From: Wu Fengguang <fengguang.wu@intel.com>
To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: Pekka Enberg <penberg@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>, Jens Axboe <jaxboe@fusionio.com>,
Linux Netdev List <netdev@vger.kernel.org>
Subject: Re: slow performance on disk/network i/o full speed after drop_caches
Date: Fri, 26 Aug 2011 10:16:48 +0800 [thread overview]
Message-ID: <20110826021648.GA19529@localhost> (raw)
In-Reply-To: <4E560F2A.1030801@profihost.ag>
Hi Stefan,
> Here is the data you requested:
>
> root@server1015-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
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.
> 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
echo t > /proc/sysrq-trigger
To dump the kernel stacks?
Thanks,
Fengguang
> 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
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next prev parent reply other threads:[~2011-08-26 2:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4E5494D4.1050605@profihost.ag>
2011-08-24 6:20 ` slow performance on disk/network i/o full speed after drop_caches Pekka Enberg
2011-08-24 9:01 ` Stefan Priebe - Profihost AG
2011-08-24 9:33 ` Wu Fengguang
2011-08-25 9:00 ` Stefan Priebe - Profihost AG
2011-08-26 2:16 ` Wu Fengguang [this message]
2011-08-26 2:54 ` Stefan Priebe - Profihost AG
2011-08-26 3:03 ` Wu Fengguang
2011-08-26 3:13 ` Stefan Priebe
2011-08-26 3:26 ` Wu Fengguang
2011-08-26 3:30 ` Zhu Yanhai
2011-08-26 6:18 ` Stefan Priebe - Profihost AG
2011-08-31 7:11 ` Stefan Priebe - Profihost AG
2011-09-01 4:14 ` Wu Fengguang
2011-09-01 5:41 ` Stefan Priebe - Profihost AG
2011-09-01 12:57 ` Mel Gorman
2011-08-24 9:32 ` Wu Fengguang
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