From: Andi Kleen <andi@firstfloor.org>
To: Christopher Snook <csnook@redhat.com>
Cc: Netdev <netdev@vger.kernel.org>
Subject: Re: RFC: Nagle latency tuning
Date: Tue, 09 Sep 2008 00:55:57 +0200 [thread overview]
Message-ID: <87ljy2tfgi.fsf@basil.nowhere.org> (raw)
In-Reply-To: <48C59F75.6030504@redhat.com> (Christopher Snook's message of "Mon, 08 Sep 2008 17:56:05 -0400")
Christopher Snook <csnook@redhat.com> writes:
>
> I'm afraid I don't know the TCP stack intimately enough to understand
> what side effects this might have. Can someone more familiar with the
> nagle implementations please enlighten me on how this could be done,
> or why it shouldn't be?
The nagle delay you're seeing is really the delayed ack delay which
is variable on Linux (unlike a lot of other stacks). Unfortunately
due to the way delayed ack works on other stacks (especially traditional
BSD with its fixed 200ms delay) there are nasty interactions with that.
Making it too short could lead to a lot more packets even in non nagle
situations.
Ok in theory you could split the two, but that would likely have
other issues and also make nagle be a lot less useful.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-09-08 22:55 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-08 21:56 RFC: Nagle latency tuning Christopher Snook
2008-09-08 22:39 ` Rick Jones
2008-09-09 5:10 ` Chris Snook
2008-09-09 5:17 ` David Miller
2008-09-09 5:56 ` Chris Snook
2008-09-09 6:02 ` David Miller
2008-09-09 10:31 ` Mark Brown
2008-09-09 12:05 ` David Miller
2008-09-09 12:09 ` Mark Brown
2008-09-09 12:19 ` David Miller
2008-09-09 6:22 ` Evgeniy Polyakov
2008-09-09 6:28 ` Chris Snook
2008-09-09 13:00 ` Arnaldo Carvalho de Melo
2008-09-09 14:36 ` Andi Kleen
2008-09-09 18:40 ` Chris Snook
2008-09-09 19:07 ` Andi Kleen
2008-09-09 19:21 ` Arnaldo Carvalho de Melo
2008-09-11 4:08 ` Chris Snook
2008-09-09 19:59 ` David Miller
2008-09-09 20:25 ` Chris Snook
2008-09-22 10:49 ` David Miller
2008-09-22 11:09 ` David Miller
2008-09-22 20:30 ` Andi Kleen
2008-09-22 22:22 ` Chris Snook
2008-09-22 22:26 ` David Miller
2008-09-22 23:00 ` Chris Snook
2008-09-22 23:13 ` David Miller
2008-09-22 23:24 ` Andi Kleen
2008-09-22 23:21 ` David Miller
2008-09-23 0:14 ` Andi Kleen
2008-09-23 0:33 ` Rick Jones
2008-09-23 2:12 ` Andi Kleen
2008-09-23 1:40 ` David Miller
2008-09-23 2:23 ` Andi Kleen
2008-09-23 2:28 ` David Miller
2008-09-23 2:41 ` Andi Kleen
2008-09-22 22:47 ` Rick Jones
2008-09-22 22:57 ` Chris Snook
2008-09-09 16:33 ` Rick Jones
2008-09-09 16:54 ` Chuck Lever
2008-09-09 17:21 ` Arnaldo Carvalho de Melo
2008-09-09 17:54 ` Rick Jones
2008-09-08 22:55 ` Andi Kleen [this message]
2008-09-09 5:22 ` Chris Snook
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=87ljy2tfgi.fsf@basil.nowhere.org \
--to=andi@firstfloor.org \
--cc=csnook@redhat.com \
--cc=netdev@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;
as well as URLs for NNTP newsgroup(s).