From: Wu Fengguang <fengguang.wu@intel.com>
To: Stefan Priebe <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 11:26:02 +0800 [thread overview]
Message-ID: <20110826032601.GA26282@localhost> (raw)
In-Reply-To: <D299D0AE-2F3C-42E2-9723-A3D7C0108C40@profihost.ag>
On Fri, Aug 26, 2011 at 11:13:07AM +0800, Stefan Priebe wrote:
>
> >> There is at least a numastat proc file.
> >
> > Thanks. This shows that node0 is accessed 10x more than node1.
>
> What can i do to prevent this or isn't this normal when a machine mostly idles so processes are mostly processed by cpu0.
Yes, that's normal. However it should explain why it's slow even when
there are lots of free pages _globally_.
> >
> >> complete ps output:
> >> http://pastebin.com/raw.php?i=b948svzN
> >
> > In that log, scp happens to be in R state and also no other tasks in D
> > state. Would you retry in the hope of catching some stucked state?
> Sadly not as the sysrq trigger has rebootet the machine and it will now run fine for 1 or 2 days.
Oops, sorry! It might be possible to reproduce the issue by manually
eating all of the memory with sparse file data:
truncate -s 1T 1T
cp 1T /dev/null
> >
> >>> 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
> >
> > It's pretty readable dmesg, except that the data is incomplete and
> > there are nothing valuable in the uploaded portion..
> That was everything i could grab through netconsole. Is there a better way?
netconsole is enough. The partial output should be due to the reboot...
Thanks,
Fengguang
WARNING: multiple messages have this Message-ID (diff)
From: Wu Fengguang <fengguang.wu@intel.com>
To: Stefan Priebe <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 11:26:02 +0800 [thread overview]
Message-ID: <20110826032601.GA26282@localhost> (raw)
In-Reply-To: <D299D0AE-2F3C-42E2-9723-A3D7C0108C40@profihost.ag>
On Fri, Aug 26, 2011 at 11:13:07AM +0800, Stefan Priebe wrote:
>
> >> There is at least a numastat proc file.
> >
> > Thanks. This shows that node0 is accessed 10x more than node1.
>
> What can i do to prevent this or isn't this normal when a machine mostly idles so processes are mostly processed by cpu0.
Yes, that's normal. However it should explain why it's slow even when
there are lots of free pages _globally_.
> >
> >> complete ps output:
> >> http://pastebin.com/raw.php?i=b948svzN
> >
> > In that log, scp happens to be in R state and also no other tasks in D
> > state. Would you retry in the hope of catching some stucked state?
> Sadly not as the sysrq trigger has rebootet the machine and it will now run fine for 1 or 2 days.
Oops, sorry! It might be possible to reproduce the issue by manually
eating all of the memory with sparse file data:
truncate -s 1T 1T
cp 1T /dev/null
> >
> >>> 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
> >
> > It's pretty readable dmesg, except that the data is incomplete and
> > there are nothing valuable in the uploaded portion..
> That was everything i could grab through netconsole. Is there a better way?
netconsole is enough. The partial output should be due to the reboot...
Thanks,
Fengguang
--
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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-08-26 3:26 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-24 6:06 slow performance on disk/network i/o full speed after drop_caches Stefan Priebe - Profihost AG
2011-08-24 6:20 ` Pekka Enberg
2011-08-24 6:20 ` Pekka Enberg
2011-08-24 9:01 ` Stefan Priebe - Profihost AG
2011-08-24 9:01 ` Stefan Priebe - Profihost AG
2011-08-24 9:33 ` Wu Fengguang
2011-08-24 9:33 ` Wu Fengguang
2011-08-25 9:00 ` Stefan Priebe - Profihost AG
2011-08-25 9:00 ` Stefan Priebe - Profihost AG
2011-08-26 2:16 ` Wu Fengguang
2011-08-26 2:16 ` Wu Fengguang
2011-08-26 2:54 ` Stefan Priebe - Profihost AG
2011-08-26 2:54 ` Stefan Priebe - Profihost AG
2011-08-26 3:03 ` Wu Fengguang
2011-08-26 3:03 ` Wu Fengguang
2011-08-26 3:13 ` Stefan Priebe
2011-08-26 3:13 ` Stefan Priebe
2011-08-26 3:26 ` Wu Fengguang [this message]
2011-08-26 3:26 ` Wu Fengguang
2011-08-26 3:30 ` Zhu Yanhai
2011-08-26 3:30 ` Zhu Yanhai
2011-08-26 6:18 ` Stefan Priebe - Profihost AG
2011-08-26 6:18 ` Stefan Priebe - Profihost AG
2011-08-31 7:11 ` Stefan Priebe - Profihost AG
2011-08-31 7:11 ` Stefan Priebe - Profihost AG
2011-09-01 4:14 ` Wu Fengguang
2011-09-01 4:14 ` Wu Fengguang
2011-09-01 5:41 ` Stefan Priebe - Profihost AG
2011-09-01 5:41 ` Stefan Priebe - Profihost AG
2011-09-01 12:57 ` Mel Gorman
2011-09-01 12:57 ` Mel Gorman
2011-08-24 9:32 ` Wu Fengguang
2011-08-24 9:32 ` Wu Fengguang
2011-08-24 9:32 ` Wu Fengguang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110826032601.GA26282@localhost \
--to=fengguang.wu@intel.com \
--cc=akpm@linux-foundation.org \
--cc=jaxboe@fusionio.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mel@csn.ul.ie \
--cc=netdev@vger.kernel.org \
--cc=penberg@kernel.org \
--cc=s.priebe@profihost.ag \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.