From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Ingo Molnar <mingo@elte.hu>
Cc: Manfred Spraul <manfred@colorfullife.com>, linux-kernel@vger.kernel.org
Subject: Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1
Date: Wed, 10 Jan 2001 17:18:28 +0100 [thread overview]
Message-ID: <20010110171828.I30055@pcep-jamie.cern.ch> (raw)
In-Reply-To: <3A5C4FAC.CA6E46A9@colorfullife.com> <Pine.LNX.4.30.0101101304330.1681-100000@e2>
In-Reply-To: <Pine.LNX.4.30.0101101304330.1681-100000@e2>; from mingo@elte.hu on Wed, Jan 10, 2001 at 01:07:53PM +0100
Ingo Molnar wrote:
> > > well, this is a performance problem if you are using threads. For normal
> > > processes there is no need for a SMP cross-call, there TLB flushes are
> > > local only.
> > >
> > But that would be ugly as hell:
> > so apache 2.0 would become slower with MSG_NOCOPY, whereas samba 2.2
> > would become faster.
>
> there *is* a cost of having a shared VM - and this is i suspect
> unavoidable.
Is it possible to avoid the SMP cross-call in the case that the other
threads have neither accessed nor dirtied the page in question?
One way to implement this is to share VMs but not the page tables, or to
share parts of the page tables that don't contain writable pages.
Just a sudden inspired thought... I don't know if it is possible or
worthwhile.
enjoy,
-- Jamie
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
next prev parent reply other threads:[~2001-01-10 16:20 UTC|newest]
Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-10 8:41 Manfred Spraul
2001-01-10 8:31 ` David S. Miller
2001-01-10 11:25 ` Ingo Molnar
2001-01-10 12:03 ` Manfred Spraul
2001-01-10 12:07 ` Ingo Molnar
2001-01-10 16:18 ` Jamie Lokier [this message]
2001-01-13 15:43 ` yodaiken
-- strict thread matches above, loose matches on Subject: below --
2001-01-09 17:46 Manfred Spraul
2001-01-09 13:08 Stephen Landamore
2001-01-09 13:24 ` Ingo Molnar
2001-01-09 13:47 ` Andrew Morton
2001-01-09 19:15 ` Dan Hollis
2001-01-09 19:14 ` Dan Hollis
2001-01-09 22:03 ` David S. Miller
2001-01-09 22:58 ` Dan Hollis
2001-01-09 22:59 ` Ingo Molnar
2001-01-09 23:11 ` Dan Hollis
2001-01-10 3:24 ` Chris Wedgwood
2001-01-08 21:56 Jes Sorensen
2001-01-08 1:24 ` David S. Miller
2001-01-08 10:39 ` Christoph Hellwig
2001-01-08 10:34 ` David S. Miller
2001-01-08 18:05 ` Rik van Riel
2001-01-08 21:07 ` David S. Miller
2001-01-09 10:23 ` Ingo Molnar
2001-01-09 10:31 ` David S. Miller
2001-01-09 11:28 ` Christoph Hellwig
2001-01-09 12:04 ` Ingo Molnar
2001-01-09 14:25 ` Stephen C. Tweedie
2001-01-09 14:33 ` Alan Cox
2001-01-09 15:00 ` Ingo Molnar
2001-01-09 15:27 ` Stephen C. Tweedie
2001-01-09 16:16 ` Ingo Molnar
2001-01-09 16:37 ` Alan Cox
2001-01-09 16:48 ` Ingo Molnar
2001-01-09 17:29 ` Alan Cox
2001-01-09 17:38 ` Jens Axboe
2001-01-09 18:38 ` Ingo Molnar
2001-01-09 19:54 ` Andrea Arcangeli
2001-01-09 20:10 ` Ingo Molnar
2001-01-10 0:00 ` Andrea Arcangeli
2001-01-09 20:12 ` Jens Axboe
2001-01-09 23:20 ` Andrea Arcangeli
2001-01-09 23:34 ` Jens Axboe
2001-01-09 23:52 ` Andrea Arcangeli
2001-01-17 5:16 ` Rik van Riel
2001-01-09 17:56 ` Chris Evans
2001-01-09 18:41 ` Ingo Molnar
2001-01-09 19:20 ` J Sloan
2001-01-09 18:10 ` Stephen C. Tweedie
2001-01-09 15:38 ` Benjamin C.R. LaHaise
2001-01-09 16:40 ` Ingo Molnar
2001-01-09 17:30 ` Benjamin C.R. LaHaise
2001-01-09 18:12 ` Stephen C. Tweedie
2001-01-09 18:35 ` Ingo Molnar
2001-01-09 17:53 ` Christoph Hellwig
2001-01-09 21:13 ` David S. Miller
2001-01-09 19:14 ` Linus Torvalds
2001-01-09 20:07 ` Ingo Molnar
2001-01-09 20:15 ` Linus Torvalds
2001-01-09 20:36 ` Christoph Hellwig
2001-01-09 20:55 ` Linus Torvalds
2001-01-09 21:12 ` Christoph Hellwig
2001-01-09 21:26 ` Linus Torvalds
2001-01-10 7:42 ` Christoph Hellwig
2001-01-10 8:05 ` Linus Torvalds
2001-01-10 8:33 ` Christoph Hellwig
2001-01-10 8:37 ` Andrew Morton
2001-01-10 23:32 ` Linus Torvalds
2001-01-19 15:55 ` Andrew Scott
2001-01-17 14:05 ` Rik van Riel
2001-01-18 0:53 ` Christoph Hellwig
2001-01-18 1:13 ` Linus Torvalds
2001-01-18 17:50 ` Christoph Hellwig
2001-01-18 18:04 ` Linus Torvalds
2001-01-18 21:12 ` Albert D. Cahalan
2001-01-19 6:55 ` Linus Torvalds
2001-01-09 23:06 ` Benjamin C.R. LaHaise
2001-01-09 23:54 ` Linus Torvalds
2001-01-10 7:51 ` Gerd Knorr
2001-01-12 1:42 ` Stephen C. Tweedie
2001-01-09 11:42 ` David S. Miller
2001-01-09 10:31 ` Christoph Hellwig
2001-01-09 11:05 ` Ingo Molnar
2001-01-09 18:27 ` Christoph Hellwig
2001-01-09 19:19 ` Ingo Molnar
2001-01-09 14:18 ` Stephen C. Tweedie
2001-01-09 14:40 ` Ingo Molnar
2001-01-09 14:51 ` Alan Cox
2001-01-09 15:17 ` Stephen C. Tweedie
2001-01-09 15:37 ` Ingo Molnar
2001-01-09 22:25 ` Linus Torvalds
2001-01-10 15:21 ` Stephen C. Tweedie
2001-01-09 15:25 ` Stephen Frost
2001-01-09 15:40 ` Ingo Molnar
2001-01-09 15:48 ` Stephen Frost
2001-01-10 1:14 ` Dave Zarzycki
2001-01-10 1:14 ` David S. Miller
2001-01-10 2:18 ` Dave Zarzycki
2001-01-10 1:19 ` Ingo Molnar
2001-01-09 21:18 ` David S. Miller
2001-01-08 21:48 ` David S. Miller
2001-01-08 22:32 ` Jes Sorensen
2001-01-08 22:37 ` David S. Miller
2001-01-08 22:43 ` Stephen Frost
2001-01-08 22:36 ` David S. Miller
2001-01-09 12:12 ` Ingo Molnar
2001-01-09 13:42 ` David S. Miller
2001-01-09 21:19 ` David S. Miller
2001-01-09 13:52 ` Trond Myklebust
2001-01-09 15:27 ` Trond Myklebust
2001-01-10 9:21 ` Trond Myklebust
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=20010110171828.I30055@pcep-jamie.cern.ch \
--to=lk@tantalophile.demon.co.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=manfred@colorfullife.com \
--cc=mingo@elte.hu \
/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
all inboxes | Powered by JetHome®