From: Diego Calleja <diegocg@gmail.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: alan@lxorguk.ukuu.org.uk, oleg@tv-sign.ru, wli@holomorphy.com,
linux-kernel@vger.kernel.org
Subject: Re: Make pipe data structure be a circular list of pages, rather than
Date: Fri, 7 Jan 2005 23:53:27 +0100 [thread overview]
Message-ID: <20050107235327.788ee7a8.diegocg@gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0501071349320.2272@ppc970.osdl.org>
El Fri, 7 Jan 2005 13:59:53 -0800 (PST) Linus Torvalds <torvalds@osdl.org> escribió:
> Btw, from limited testing this effect seems to be much more pronounced on
> SMP.
I've tried it in a 2xPIII, 512 MB of ram. I've done kernel compiles...yeah
yeah I know kernel compiles are not a good benchmark but since linux uses
-pipe for gcc...I though it may try it to see if it makes a difference
(suggestions about better methods to test this are accepted :). The results
could be very well stadistical noise (it looks like it only takes a second less
on average), but I though it may be interesting.
without the patch:
952.84user 98.64system 8:54.64elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318007minor)pagefaults 0swaps
951.78user 98.25system 8:53.71elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318009minor)pagefaults 0swaps
954.53user 99.12system 8:53.02elapsed 197%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318041minor)pagefaults 0swaps
with it:
951.67user 97.59system 8:53.12elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318010minor)pagefaults 0swaps
949.04user 97.68system 8:52.04elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318018minor)pagefaults 0swaps
948.40user 97.37system 8:51.48elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318011minor)pagefaults 0swaps
next prev parent reply other threads:[~2005-01-07 22:57 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-07 14:30 Oleg Nesterov
2005-01-07 15:45 ` Alan Cox
2005-01-07 17:23 ` Linus Torvalds
2005-01-08 18:25 ` Hugh Dickins
2005-01-08 18:54 ` Linus Torvalds
2005-01-07 16:17 ` Linus Torvalds
2005-01-07 16:06 ` Alan Cox
2005-01-07 17:33 ` Linus Torvalds
2005-01-07 17:48 ` Linus Torvalds
2005-01-07 20:59 ` Mike Waychison
2005-01-07 23:46 ` Chris Friesen
2005-01-08 21:38 ` Lee Revell
2005-01-08 21:51 ` Linus Torvalds
2005-01-08 22:02 ` Lee Revell
2005-01-08 22:29 ` Davide Libenzi
2005-01-09 4:07 ` Linus Torvalds
2005-01-09 23:19 ` Davide Libenzi
2005-01-14 10:15 ` Peter Chubb
2005-01-07 21:59 ` Linus Torvalds
2005-01-07 22:53 ` Diego Calleja [this message]
2005-01-07 23:15 ` Linus Torvalds
2005-01-10 23:23 ` Robert White
2005-01-07 17:45 ` Chris Friesen
2005-01-07 16:39 ` Davide Libenzi
2005-01-07 17:09 ` Linus Torvalds
2005-08-18 6:07 ` Coywolf Qi Hunt
-- strict thread matches above, loose matches on Subject: below --
2005-01-20 2:14 Robert White
2005-01-16 2:59 Make pipe data structure be a circular list of pages, rather Linus Torvalds
2005-01-19 21:12 ` Make pipe data structure be a circular list of pages, rather than linux
2005-01-20 2:06 ` Robert White
[not found] <Pine.LNX.4.44.0501091946020.3620-100000@localhost.localdomain>
[not found] ` <Pine.LNX.4.58.0501091713300.2373@ppc970.osdl.org>
[not found] ` <Pine.LNX.4.58.0501091830120.2373@ppc970.osdl.org>
2005-01-12 19:50 ` Davide Libenzi
2005-01-12 20:10 ` Linus Torvalds
[not found] <200501070313.j073DCaQ009641@hera.kernel.org>
2005-01-07 3:41 ` William Lee Irwin III
2005-01-07 6:35 ` Linus Torvalds
2005-01-07 6:37 ` Linus Torvalds
2005-01-19 16:29 ` Larry McVoy
2005-01-19 17:14 ` Linus Torvalds
2005-01-19 19:01 ` Larry McVoy
2005-01-20 0:01 ` Linus Torvalds
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