From: Andrew Morton <akpm@digeo.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Dave Hansen <haveblue@us.ibm.com>,
colpatch@us.ibm.com, "Martin J. Bligh" <mbligh@aracnet.com>,
Michael Hohnbaum <hohnbaum@us.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] per-zone^Wnode kswapd process
Date: Fri, 13 Sep 2002 18:19:36 -0700 [thread overview]
Message-ID: <3D828EA8.EF24BAD0@digeo.com> (raw)
In-Reply-To: 20020914001235.GG3530@holomorphy.com
William Lee Irwin III wrote:
>
> ...
> On Fri, Sep 13, 2002 at 05:02:56PM -0700, Andrew Morton wrote:
> > Why do I see only one kswapd here?
> > Are you claiming an overall 4x improvement, or what?
> > I'll add some instrumentation whch tells us how many pages
> > kswapd is reclaiming versus direct reclaim.
>
> I can catch the others running if I refresh more often:
>
> 38 root 15 0 0 0 0 DW 4.8 0.0 1:57 kswapd0
> 36 root 15 0 0 0 0 SW 2.7 0.0 0:16 kswapd2
>
> 4779 wli 22 0 4476 3604 1648 R 9.2 0.0 0:58 top
> 37 root 15 0 0 0 0 SW 2.6 0.0 0:16 kswapd1
>
> 38 root 15 0 0 0 0 DW 2.9 0.0 2:12 kswapd0
> 36 root 15 0 0 0 0 SW 1.8 0.0 0:22 kswapd2
>
> 4779 wli 25 0 4476 3600 1648 R 7.4 0.0 1:18 top
> 37 root 15 0 0 0 0 SW 2.7 0.0 0:21 kswapd1
>
> 4779 wli 24 0 4476 3600 1648 R 37.5 0.0 1:49 top
> 37 root 16 0 0 0 0 RW 11.1 0.0 0:23 kswapd1
>
> 4779 wli 25 0 4476 3600 1648 R 14.1 0.0 1:51 top
> 35 root 15 0 0 0 0 SW 6.9 0.0 0:24 kswapd3
>
> 38 root 15 0 0 0 0 RW 2.9 0.0 2:29 kswapd0
> 37 root 16 0 0 0 0 SW 1.4 0.0 0:28 kswapd1
>
> etc.
>
> Not sure about baselines. I'm happier because there's more cpu
> utilization. kswapd0 is relatively busy so the other ones take some
> load off of it. The benchmark isn't quite done yet. I think four
> dbench 512's in parallel might be easier to extract results from.
> tiobench also looks like it's getting some cpu:
>
OK, thanks.
Could you please go into /proc/<pif_of_kswapd>/cpu and double
check that each kswapd is only racking up points on the CPUs
which it is supposed to be running on? As a little sanity check...
(hm. Why isn't cpus_allowed displayed from in there?)
Also, we need to double check that I'm not completely full of
unmentionables, and that kswapd really is doing useful work there.
I can check that.
I'll do an mm4 in a mo (as soon as I work out who did the dud patch
which stops it booting) and we can see what the kwapd-versus-direct-reclaim
ratio looks like.
next prev parent reply other threads:[~2002-09-14 0:59 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-13 3:33 [PATCH] per-zone kswapd process Dave Hansen
2002-09-13 4:06 ` Andrew Morton
2002-09-13 4:59 ` William Lee Irwin III
2002-09-13 5:10 ` Martin J. Bligh
[not found] ` <3D8232DE.9090000@us.ibm.com>
[not found] ` <3D823702.8E29AB4F@digeo.com>
[not found] ` <3D8251D6.3060704@us.ibm.com>
[not found] ` <3D82566B.EB2939D5@digeo.com>
2002-09-13 22:52 ` [PATCH] per-zone^Wnode " Dave Hansen
2002-09-13 23:24 ` Matthew Dobson
2002-09-13 23:29 ` Matthew Dobson
2002-09-13 23:46 ` William Lee Irwin III
2002-09-14 0:02 ` Andrew Morton
2002-09-14 0:12 ` William Lee Irwin III
2002-09-14 1:19 ` Andrew Morton [this message]
2002-09-13 5:46 ` [PATCH] per-zone " Andrew Morton
2002-09-13 5:38 ` Martin J. Bligh
2002-09-13 6:03 ` Andrew Morton
2002-09-13 13:05 ` Alan Cox
2002-09-13 21:30 ` William Lee Irwin III
2002-09-18 16:07 ` [PATCH] recognize MAP_LOCKED in mmap() call Hubertus Franke
2002-09-18 16:29 ` Andrew Morton
2002-09-16 5:44 ` [PATCH] per-zone kswapd process Daniel Phillips
2002-09-16 7:46 ` William Lee Irwin III
2002-09-16 15:12 ` Rik van Riel
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=3D828EA8.EF24BAD0@digeo.com \
--to=akpm@digeo.com \
--cc=colpatch@us.ibm.com \
--cc=haveblue@us.ibm.com \
--cc=hohnbaum@us.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mbligh@aracnet.com \
--cc=wli@holomorphy.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).