From: Randolph Chung <randolph@tausq.org>
To: Riccardo <rollei@tiscalinet.it>
Cc: ryan_bradetich@hp.com, parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] LMBench results on for the C200 for HP-UX 10.20, Linux 2.4.24-pa0, and Linux 2.6.0-pa8
Date: Wed, 7 Jan 2004 02:14:07 -0800 [thread overview]
Message-ID: <20040107101406.GS533@tausq.org> (raw)
In-Reply-To: <3FFBD4DF.ECB0ABBC@tiscalinet.it>
> HP-UX fork is fast! linux 2.6 seems to bring some relief here. I always
> marvel how fast HP-UX is when responding to a telnet login.
> Instantaneus. Probably fork() speed compensates the lower latency linux
> has in other areas.
The reason why fork() is so slow on palinux is that we flush the entire
cache for each fork() operation. this is clearly a very bad thing.
unfortunately this doesn't seem like a simple thing to fix. From some
previous discussions it seems like we don't need to do the cache
flushing for fork(), but when i got rid of it the system crashes very
quickly. Possibly the per-fork cache flush is masking other bugs in the
kernel cache flushing infrastructure.
randolph
--
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/
prev parent reply other threads:[~2004-01-07 10:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-07 9:07 [parisc-linux] LMBench results on for the C200 for HP-UX 10.20, Linux 2.4.24-pa0, and Linux 2.6.0-pa8 Ryan Bradetich
2004-01-07 9:43 ` Riccardo
2004-01-07 10:14 ` Randolph Chung [this message]
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