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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.