From: John Heffner <jheffner@psc.edu>
To: Stephen Hemminger <shemminger@osdl.org>
Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: [RFC] TCP limited slow start
Date: Sat, 03 Jun 2006 12:46:57 -0400 [thread overview]
Message-ID: <4481BD01.9020906@psc.edu> (raw)
In-Reply-To: <20060602185403.1549e3c6@localhost.localdomain>
Stephen Hemminger wrote:
> Rolled my sleeve's up and gave this a try...
>
> This is a implementation of Sally Floyd's Limited Slow Start
> for Large Congestion Windows.
Limited slow start is useful as a work-around for bottleneck queues that
are inappropriately short. I don't think it's good to run it all the
time by default (with a max_ssthresh < infinity), because it slows down
flows on healthy paths, and introduces another non-scalable parameter to
TCP.
I see it as potentially useful as a per-route parameter, where you set
it deliberately to work around some known problematic path. A sysctl
with a default value of infinity might be okay as well.
Practically speaking, we've had this in the Web100 patch for a long time
(and still do, look for WAD_MaxSsthresh), but I've never found it all
that useful. If the bottleneck queue is too short, you usually end up
getting screwed other ways too.
-John
next prev parent reply other threads:[~2006-06-03 16:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-02 23:13 TCP Limited slow start Stephen Hemminger
2006-06-03 1:54 ` [RFC] TCP limited " Stephen Hemminger
2006-06-03 16:46 ` John Heffner [this message]
2006-06-05 17:17 ` Stephen Hemminger
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