From: rwhron@earthlink.net
To: zwane@linuxpower.ca, jamagallon@able.es
Cc: andrea@suse.de, linux-kernel@vger.kernel.org,
lse-tech@lists.sourceforge.net
Subject: Re: pipe and af/unix latency differences between aa and jam on smp
Date: Tue, 9 Jul 2002 10:05:58 -0400 [thread overview]
Message-ID: <20020709140558.GA21293@rushmore> (raw)
> *Local* Communication latencies in microseconds - smaller is better
> kernel Pipe AF/Unix
> ----------------------------- ------- -------
> 2.4.19-pre7-jam6 29.513 42.369
> 2.4.19-pre8-jam2 7.697 15.274
> 2.4.19-pre8-jam2-nowuos 7.739 14.929
> (last line says that wake-up-sync is not responsible...)
> Main changes between first two were irqbalance and ide6->ide10.
The system is scsi only. pre7-jam6 and pre8-jam2 .config's were
identical.
> Could you try latest -rc1-aa2 ? It includes also irqbalance,
Based on Andrea'a diff logs, irqbalance appeared in 2.4.19pre10aa3.
There are small differences between the pre10-jam2 and aa irqbalance
patches. One new datapoint with pre10-jam3:
*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
kernel Pipe AF/Unix
----------------------------- ------- -------
2.4.19-pre10-jam2 7.877 16.699
2.4.19-pre10-jam3 33.133 66.825
2.4.19-pre10-aa2 34.208 62.732
2.4.19-pre10-aa4 33.941 70.216
2.4.19-rc1-aa1-1g-nio 34.989 52.704
A config difference between pre10-jam2 and pre10-jam3 is:
CONFIG_X86_SFENCE=y # pre10-jam2
pre10-jam2 was compiled with -Os and pre10-jam3 with -O2.
> Out of interest, is that a P4/Xeon?
Quad P3/Xeon 700 mhz with 1MB cache.
--
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html
next reply other threads:[~2002-07-09 14:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-09 14:05 rwhron [this message]
2002-07-09 14:53 ` pipe and af/unix latency differences between aa and jam on smp Andrea Arcangeli
-- strict thread matches above, loose matches on Subject: below --
2002-07-12 1:27 rwhron
2002-07-11 9:02 rwhron
2002-07-11 9:21 ` Andrea Arcangeli
2002-07-09 0:59 rwhron
2002-07-09 1:11 ` J.A. Magallon
2002-07-09 1:15 ` J.A. Magallon
2002-07-09 10:19 ` Zwane Mwaikambo
2002-07-09 1:25 ` J.A. Magallon
2002-07-11 20:20 ` Bill Davidsen
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