From: Peter Zaitsev <pz@spylog.ru>
To: Rik van Riel <riel@conectiva.com.br>
Cc: linux-kernel@vger.kernel.org
Subject: Re[3]: MMAP vs READ/WRITE
Date: Wed, 13 Mar 2002 18:17:35 +0300 [thread overview]
Message-ID: <991739488742.20020313181735@spylog.ru> (raw)
In-Reply-To: <Pine.LNX.4.44L.0203131157210.2181-100000@imladris.surriel.com>
In-Reply-To: <Pine.LNX.4.44L.0203131157210.2181-100000@imladris.surriel.com>
Hello Rik,
Wednesday, March 13, 2002, 5:58:08 PM, you wrote:
RvR> That would be a bit premature since this part of the code
RvR> hasn't been touched by -rmap ;)
RvR> It is something that still needs fixing, though.
:)
The most upsetting thing is the followings:
0 2 0 210736 19472 2000 733188 216 0 5068 2 382 340 4 2 94
0 2 0 210424 20108 1860 729596 219 0 4732 0 319 352 4 1 96
0 2 0 210216 19652 1616 727280 254 0 4718 10 313 298 3 4 93
1 1 0 209756 19988 1744 723940 285 0 4523 14 313 197 6 6 88
0 2 0 209700 20096 1904 722236 223 0 4485 15 307 265 7 5 88
Note some pages coming up from swap.
This is vmstat exactly corresponding to doing read via mmap. So it
looks like current VM preforms in come cases to swap out pages from
mapped files rather then discarding them :(
This of course reduces performance on sequential IO :(
--
Best regards,
Peter mailto:pz@spylog.ru
next prev parent reply other threads:[~2002-03-13 15:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-13 13:17 Peter Zaitsev
2002-03-13 13:41 ` Oleg Drokin
2002-03-13 13:58 ` Rik van Riel
2002-03-13 14:48 ` Re[2]: " Peter Zaitsev
2002-03-13 14:58 ` Rik van Riel
2002-03-13 15:17 ` Peter Zaitsev [this message]
2002-03-14 9:27 ` Peter Zaitsev
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=991739488742.20020313181735@spylog.ru \
--to=pz@spylog.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=riel@conectiva.com.br \
/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
all inboxes | Powered by JetHome®