From: David Miller <davem@davemloft.net>
To: shemminger@linux-foundation.org
Cc: doug.leith@nuim.ie, netdev@vger.kernel.org
Subject: Re: [PATCH] TCP: H-TCP maxRTT estimation at startup
Date: Tue, 07 Aug 2007 18:29:17 -0700 (PDT) [thread overview]
Message-ID: <20070807.182917.101870814.davem@davemloft.net> (raw)
In-Reply-To: <20070803105756.2f41dc25@oldman.hamilton.local>
From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Fri, 3 Aug 2007 10:57:56 +0100
> Small patch to H-TCP from Douglas Leith.
>
> Fix estimation of maxRTT. The original code ignores rtt measurements
> during slow start (via the check tp->snd_ssthresh < 0xFFFF) yet this
> is probably a good time to try to estimate max rtt as delayed acking
> is disabled and slow start will only exit on a loss which presumably
> corresponds to a maxrtt measurement. Second, the original code (via
> the check htcp_ccount(ca) > 3) ignores rtt data during what it
> estimates to be the first 3 round-trip times. This seems like an
> unnecessary check now that the RCV timestamp are no longer used
> for rtt estimation.
>
> Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Applied, thanks Stephen.
prev parent reply other threads:[~2007-08-08 1:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CA61FA76-2C22-4048-B7AC-1D8E9D94868C@nuim.ie>
2007-08-03 9:57 ` [PATCH] TCP: H-TCP maxRTT estimation at startup Stephen Hemminger
2007-08-08 1:29 ` David Miller [this message]
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