From: Rick Jones <rick.jones2@hp.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Larry McVoy <lm@bitmover.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
davem@davemloft.net, wscott@bitmover.com, netdev@vger.kernel.org
Subject: Re: tcp bw in 2.6
Date: Tue, 02 Oct 2007 12:53:02 -0700 [thread overview]
Message-ID: <4702A19E.5090403@hp.com> (raw)
In-Reply-To: <alpine.LFD.0.999.0710021146580.3579@woody.linux-foundation.org>
> I also would have expected more ACK's from the HP box. It's been a long
> time since I did TCP, but I thought the rule was still that you were
> supposed to ACK at least every other full frame - but the HP box is acking
> roughly every 16K (and it's *not* always at TSO boundaries: the earlier
> ACK's in the sequence are at 1460-byte packet boundaries, but it does seem
> to end up getting into that pattern later on).
Drift...
The RFC's say "SHOULD" (emphasis theirs) rather than "MUST."
Both HP-UX and Solaris have rather robust ACK avoidance heuristics to cut-down
on the CPU overhead of bulk transfers. (That they both have them stems from
their being cousins, sharing a common TCP stack ancestor long ago - both of
course have been diverging since then).
rick jones
next prev parent reply other threads:[~2007-10-02 19:53 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070929142517.EC6AB5FB21@work.bitmover.com>
[not found] ` <alpine.LFD.0.999.0709290914410.3579@woody.linux-foundation.org>
[not found] ` <20070929172639.GB7037@bitmover.com>
[not found] ` <alpine.LFD.0.999.0709291050200.3579@woody.linux-foundation.org>
2007-10-02 0:59 ` tcp bw in 2.6 Larry McVoy
2007-10-02 2:14 ` Linus Torvalds
2007-10-02 2:20 ` Larry McVoy
2007-10-02 3:50 ` David Miller
2007-10-02 4:23 ` Larry McVoy
2007-10-02 15:06 ` John Heffner
2007-10-02 17:14 ` Rick Jones
2007-10-02 17:20 ` Larry McVoy
2007-10-02 18:01 ` Rick Jones
2007-10-02 18:40 ` Larry McVoy
2007-10-02 19:47 ` Rick Jones
2007-10-02 21:32 ` David Miller
2007-10-03 7:19 ` Bill Fink
2007-10-02 10:52 ` Herbert Xu
2007-10-02 15:09 ` Larry McVoy
2007-10-02 15:41 ` Larry McVoy
2007-10-02 16:25 ` Larry McVoy
2007-10-02 16:47 ` Stephen Hemminger
2007-10-02 16:49 ` Larry McVoy
2007-10-02 17:10 ` Stephen Hemminger
2007-10-15 12:40 ` Daniel Schaffrath
2007-10-15 15:49 ` Stephen Hemminger
2007-10-02 16:34 ` Linus Torvalds
2007-10-02 16:48 ` Larry McVoy
2007-10-02 21:16 ` David Miller
2007-10-02 21:26 ` Larry McVoy
2007-10-02 21:47 ` David Miller
2007-10-02 22:17 ` Rick Jones
2007-10-02 22:32 ` David Miller
2007-10-02 22:36 ` Larry McVoy
2007-10-02 22:59 ` Rick Jones
2007-10-03 8:02 ` David Miller
2007-10-02 16:48 ` Ben Greear
2007-10-02 17:11 ` Larry McVoy
2007-10-02 17:18 ` Ben Greear
2007-10-02 17:21 ` Larry McVoy
2007-10-02 17:54 ` Stephen Hemminger
2007-10-02 18:35 ` Larry McVoy
2007-10-02 18:29 ` John Heffner
2007-10-02 19:07 ` Larry McVoy
2007-10-02 19:29 ` Linus Torvalds
2007-10-02 20:31 ` David Miller
2007-10-02 19:33 ` Larry McVoy
2007-10-02 19:53 ` John Heffner
2007-10-02 20:14 ` Larry McVoy
2007-10-02 20:40 ` Rick Jones
2007-10-02 20:42 ` Wayne Scott
2007-10-02 21:56 ` Linus Torvalds
2007-10-02 19:27 ` Linus Torvalds
2007-10-02 19:53 ` Rick Jones [this message]
2007-10-02 20:33 ` David Miller
2007-10-02 20:44 ` Roland Dreier
2007-10-02 21:21 ` Larry McVoy
2007-10-03 21:13 ` Pekka Pietikainen
2007-10-03 21:23 ` Larry McVoy
2007-10-03 21:50 ` Pekka Pietikainen
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=4702A19E.5090403@hp.com \
--to=rick.jones2@hp.com \
--cc=davem@davemloft.net \
--cc=herbert@gondor.apana.org.au \
--cc=lm@bitmover.com \
--cc=netdev@vger.kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=wscott@bitmover.com \
/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).