From: James Antill <james@and.org>
To: "Darren Smith" <data@barrysworld.com>
Cc: "'Aaron Sethman'" <androsyn@ratbox.org>,
"'Andrew Morton'" <akpm@zip.com.au>,
"'Dan Kegel'" <dank@kegel.com>,
"'Vincent Sweeney'" <v.sweeney@barrysworld.com>,
<linux-kernel@vger.kernel.org>, <coder-com@undernet.org>,
"'Kevin L. Mitchell'" <klmitch@mit.edu>
Subject: Re: [Coder-Com] Re: PROBLEM: high system usage / poor SMP network performance
Date: 08 Feb 2002 17:11:38 -0500 [thread overview]
Message-ID: <nnn0yjaajp.fsf@code.and.org> (raw)
In-Reply-To: <000001c1ada7$5ad5cfb0$5c5a1e3e@wilma>
In-Reply-To: <000001c1ada7$5ad5cfb0$5c5a1e3e@wilma>
"Darren Smith" <data@barrysworld.com> writes:
> I mean I added a usleep() before the poll in s_bsd.c for the undernet
> 2.10.10 code.
>
> timeout = (IRCD_MIN(delay2, delay)) * 1000;
> + usleep(100000); <- New Line
> nfds = poll(poll_fds, pfd_count, timeout);
>
> And now we're using 1/8th the cpu! With no noticeable effects.
Note that something else you want to do is call poll() with a 0
timeout first (and if that doesn't return anything call again with the
timeout), this removes all the wait queue manipulation inside the
kernel when something is ready (most of the time).
--
# James Antill -- james@and.org
:0:
* ^From: .*james@and\.org
/dev/null
next prev parent reply other threads:[~2002-02-08 22:18 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-29 18:00 PROBLEM: high system usage / poor SMP network performance Dan Kegel
2002-01-29 20:09 ` Vincent Sweeney
2002-01-31 5:24 ` Dan Kegel
[not found] ` <001d01c1aa8e$2e067e60$0201010a@frodo>
2002-02-03 8:03 ` Dan Kegel
2002-02-03 8:36 ` Andrew Morton
2002-02-04 14:57 ` [Coder-Com] " Darren Smith
2002-02-04 17:41 ` Aaron Sethman
2002-02-04 18:11 ` Darren Smith
2002-02-04 18:30 ` Aaron Sethman
2002-02-04 18:48 ` Kev
2002-02-04 18:59 ` Aaron Sethman
2002-02-04 18:53 ` Doug McNaught
2002-02-08 22:11 ` James Antill [this message]
2002-02-12 18:48 ` Vincent Sweeney
2002-02-03 19:22 ` Kev
[not found] ` <5.1.0.14.2.20020203173247.02c946e8@pop.euronet.nl>
2002-02-03 19:16 ` [Coder-Com] Re: PROBLEM: high system usage / poor SMPnetwork performance Dan Kegel
2002-02-04 0:07 ` Kev
2002-02-04 0:37 ` Dan Kegel
2002-02-04 0:59 ` Aaron Sethman
2002-02-04 1:16 ` Dan Kegel
2002-02-04 1:30 ` Aaron Sethman
2002-02-04 1:38 ` Dan Kegel
2002-02-04 4:38 ` Aaron Sethman
2002-02-04 5:35 ` Dan Kegel
2002-02-04 5:43 ` Aaron Sethman
2002-02-04 6:11 ` Daniel Phillips
2002-02-04 6:26 ` Aaron Sethman
2002-02-04 6:29 ` Daniel Phillips
2002-02-04 6:39 ` Aaron Sethman
2002-02-04 2:55 ` Kev
2002-02-04 3:25 ` Dan Kegel
2002-02-04 4:47 ` Aaron Sethman
2002-02-04 5:10 ` Kev
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