From: Roger Larsson <roger.larsson@norran.net>
To: Ed Tomlinson <tomlins@cam.org>,
list linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Retest: Re: New VM Testcase (2.4.18pre7 SWAPS) (2.4.17-rmap12b OK)
Date: Wed, 6 Feb 2002 00:15:36 +0100 [thread overview]
Message-ID: <200202052318.g15NIfF27385@maila.telia.com> (raw)
In-Reply-To: <20020205003614.1036BF6E7@oscar.casa.dyndns.org>
On Tuesdayen den 5 February 2002 01.36, Ed Tomlinson wrote:
> On February 4, 2002 05:24 pm, Roger Larsson wrote:
> > When examining Karlsbakk problem I got into one quite different myself.
> >
> > I have a 256MB UP PII 933 MHz.
> > When running the included program with an option of 200
> > (serving 200 clients with streaming data a 10MB... on first run
> > it creates the data, from /dev/urandom - overkill from /dev/null is ok!)
> >
> > ddteset.sh 200
> > [testcase initially written by Roy Sigurd Karlsbakk, he does not get
> > into this - but he has more RAM]
> >
I rerun the testcases, this time the 2.4.18-pre8 did not go as deep - and
survived. But had worse performance - then I remembered... I had added
file readahead. Retested again - it still survived...
echo "file_readahead:255"> /proc/ide/hda/settings
The results from all tested kernels standard and with readahead follows...
2.4.18pre7
start: with 'bi' at 12000
after awhile 'bi' hovers at 7000-9000 (sporadic swap outs)
after yet some time it starts to swap in too - but without performance loss
2.4.18pre7 with file_readahead:255
start: bi at 15000-18000
after awhile heavy swap out: 600(!)-10000
after yet some time, now with swap in too: 1000-6000
2.4.18pre7 w. Ed Tomlinsons patch
start: bi at 12000
stays at: 9000-12000
more swapout causes throughput loss: 5000-9000
but finally stabilizes at 7000-10000
2.4.18pre7 w. Ed Tomlinsons patch and file_readahead
start: bi at 15000-23000
...
rather soon ends up in both swapping in and out...
(about the same throughput at 2.4.18pre7)
2.4.17rmap12c
during the whole testrun: bi at 10000-12000
exept for some short dips downto at most 8000
2.4.17rmap12c with file_readahead
during whole testrun: bi at 20000-23000
short dips downto 16000 (once 9000)
This should be a picture, but... some other day...
/RogerL
--
Roger Larsson
Skelleftea
Sweden
--
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/
prev parent reply other threads:[~2002-02-05 23:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-04 22:24 Roger Larsson
2002-02-04 22:35 ` Stephan von Krawczynski
2002-02-05 0:36 ` Ed Tomlinson
2002-02-05 23:15 ` Roger Larsson [this message]
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=200202052318.g15NIfF27385@maila.telia.com \
--to=roger.larsson@norran.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=tomlins@cam.org \
/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