From: "Marian Ďurkovič" <md@bts.sk>
To: David Miller <davem@davemloft.net>
Cc: johnwheffner@gmail.com, netdev@vger.kernel.org
Subject: Re: TCP rx window autotuning harmful at LAN context
Date: Tue, 10 Mar 2009 12:46:06 +0100 [thread overview]
Message-ID: <20090310114606.GA84964@bts.sk> (raw)
In-Reply-To: <20090310.043019.132650585.davem@davemloft.net>
On Tue, Mar 10, 2009 at 04:30:19AM -0700, David Miller wrote:
> From: Marian Ďurkovič <md@bts.sk>
> Date: Tue, 10 Mar 2009 11:49:56 +0100
>
> > Sender does not have the relevant info to implement this - it might be
> > connected by 10 GE to the highspeed backbone.
>
> Yes, the sender does indeed have this information, and using it is
> exactly what congestion control algorithms such as VEGAS try to do.
>
> They look at both round trip times and bandwith as they increase the
> send congestion window. And if round trips increase without a
> corresponding increase in bandwidth, they stop increasing.
Yes, but that's actual bandwidth between sender and receiver, not
the hard BW limit of the receiver's NIC. My intention is just to introduce
some safety belt preventing autotuning to increase the rx window
into MB ranges when RTT is very low.
next prev parent reply other threads:[~2009-03-10 11:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-09 11:25 TCP rx window autotuning harmful at LAN context Marian Ďurkovič
2009-03-09 18:01 ` John Heffner
2009-03-09 20:05 ` Marian Ďurkovič
2009-03-09 20:24 ` Stephen Hemminger
2009-03-10 0:09 ` David Miller
2009-03-10 0:34 ` Rick Jones
2009-03-10 3:55 ` John Heffner
2009-03-10 17:20 ` Rick Jones
2009-03-11 10:03 ` Andi Kleen
2009-03-11 11:03 ` Marian Ďurkovič
2009-03-11 13:30 ` David Miller
2009-03-11 15:01 ` Andi Kleen
2009-03-11 14:56 ` Marian Ďurkovič
2009-03-11 15:34 ` John Heffner
[not found] ` <20090309195906.M50328@bts.sk>
2009-03-09 20:23 ` John Heffner
2009-03-09 20:33 ` Stephen Hemminger
2009-03-09 23:52 ` David Miller
2009-03-10 0:09 ` John Heffner
2009-03-10 5:19 ` Eric Dumazet
[not found] ` <20090310104956.GA81181@bts.sk>
2009-03-10 11:30 ` David Miller
2009-03-10 11:46 ` Marian Ďurkovič [this message]
2009-03-10 15:23 ` John Heffner
2009-03-10 16:00 ` Marian Ďurkovič
2009-03-10 16:18 ` David Miller
2009-03-11 8:29 ` Marian Ďurkovič
2009-03-11 8:41 ` David Miller
2009-03-11 9:05 ` Marian Ďurkovič
2009-03-11 9:11 ` Eric Dumazet
2009-03-11 13:25 ` David Miller
2009-03-11 9:02 ` Rémi Denis-Courmont
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=20090310114606.GA84964@bts.sk \
--to=md@bts.sk \
--cc=davem@davemloft.net \
--cc=johnwheffner@gmail.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).