From: Richard Zidlicky <rz@linux-m68k.org>
To: Jeff Dike <jdike@karaya.com>
Cc: Alan Cox <alan@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: Accelerating user mode linux
Date: Fri, 2 Aug 2002 13:34:44 +0200 [thread overview]
Message-ID: <20020802133444.E1948@linux-m68k.org> (raw)
In-Reply-To: <200208020440.XAA04793@ccure.karaya.com>; from jdike@karaya.com on Thu, Aug 01, 2002 at 11:40:28PM -0500
On Thu, Aug 01, 2002 at 11:40:28PM -0500, Jeff Dike wrote:
>
> Your objection to returning through sigreturn was performance. Is performance
> a veto of adding an mm switch to sigreturn, or it is possible to make it
> acceptible?
I have once ported Basilisk to work native on linux-m68k. It works
*slow* so I looked what the problem is - the signal delivery in
Linux is exorbitantly slow. Eg an SIGILL delivery costs ~ 1650 cycles
on a 68060, compared to that sigreturn and getpid are 200-250 and
sched_yield with context switch around 400.
So sigreturn is not the place I would be looking for the biggest
speedups.
Richard
next prev parent reply other threads:[~2002-08-02 11:56 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-01 20:16 Accelerating user mode linux Alan Cox
2002-08-02 4:40 ` Jeff Dike
2002-08-02 9:50 ` Alan Cox
2002-08-02 18:28 ` Jeff Dike
2002-08-02 17:48 ` Alan Cox
2002-08-02 22:33 ` Jeff Dike
2002-08-02 21:57 ` Alan Cox
2002-08-03 0:54 ` Jeff Dike
2002-08-02 11:34 ` Richard Zidlicky [this message]
2002-08-02 13:28 ` Alan Cox
2002-08-03 11:38 ` context switch vs. signal delivery [was: Re: Accelerating user mode linux] Ingo Molnar
2002-08-03 12:33 ` context switch vs. signal delivery [was: Re: Accelerating user mode Alan Cox
2002-08-03 15:29 ` Jeff Dike
2002-08-05 13:46 ` Udo A. Steinberg
2002-08-05 20:44 ` Richard Zidlicky
2002-08-05 22:34 ` Udo A. Steinberg
2002-08-06 0:42 ` Jeff Dike
2002-08-06 0:16 ` Udo A. Steinberg
2002-08-06 2:55 ` Jeff Dike
2002-08-06 8:10 ` Udo A. Steinberg
2002-08-06 11:20 ` Jeff Dike
2002-08-06 11:13 ` Udo A. Steinberg
2002-08-06 12:53 ` Jeff Dike
2002-08-06 13:04 ` Udo A. Steinberg
2002-08-06 14:12 ` Jeff Dike
2002-08-06 16:02 ` Udo A. Steinberg
2002-08-06 17:42 ` Jeff Dike
2002-08-06 18:01 ` Udo A. Steinberg
2002-08-08 1:27 ` Udo A. Steinberg
2002-08-08 3:14 ` Jeff Dike
2002-08-08 2:21 ` Benjamin LaHaise
2002-08-08 9:03 ` Udo A. Steinberg
2002-08-08 17:19 ` Jeff Dike
2002-08-05 22:06 ` Martin Waitz
2002-08-06 0:49 ` Jeff Dike
2002-08-04 6:46 ` context switch vs. signal delivery [was: Re: Accelerating user mode linux] Andi Kleen
2002-08-05 5:35 ` Linus Torvalds
2002-08-05 5:42 ` Arnaldo Carvalho de Melo
2002-08-05 6:37 ` Lincoln Dale
2002-08-05 15:39 ` Jamie Lokier
2002-08-05 16:38 ` Linus Torvalds
2002-08-05 20:01 ` context switch vs. signal delivery [was: Re: Accelerating usermode linux] Oliver Neukum
2002-08-05 20:23 ` Linus Torvalds
2002-08-06 5:31 ` context switch vs. signal delivery [was: Re: Accelerating user mode linux] Mark Mielke
2002-08-05 10:40 ` Ingo Molnar
2002-08-05 14:59 ` Larry McVoy
2002-08-05 15:41 ` Jamie Lokier
2002-08-05 15:44 ` Jamie Lokier
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=20020802133444.E1948@linux-m68k.org \
--to=rz@linux-m68k.org \
--cc=alan@redhat.com \
--cc=jdike@karaya.com \
--cc=linux-kernel@vger.kernel.org \
/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