From: Stephen Hemminger <shemminger@linux-foundation.org>
To: David Miller <davem@davemloft.net>
Cc: billfink@mindspring.com, sangtae.ha@gmail.com, rhee@eos.ncsu.edu,
rhee@ncsu.edu, netdev@vger.kernel.org
Subject: Re: 2.6.20.7 TCP cubic (and bic) initial slow start way too slow?
Date: Tue, 12 Jun 2007 17:16:03 -0700 [thread overview]
Message-ID: <20070612171603.47736395@localhost> (raw)
In-Reply-To: <20070612.151258.120619253.davem@davemloft.net>
On Tue, 12 Jun 2007 15:12:58 -0700 (PDT)
David Miller <davem@davemloft.net> wrote:
> From: Bill Fink <billfink@mindspring.com>
> Date: Wed, 16 May 2007 02:44:09 -0400
>
> > [root@lang2 ~]# netstat -s | grep -i retrans
> > 25446 segments retransmited
> > 20936 fast retransmits
> > 4503 retransmits in slow start
> > 4 sack retransmits failed
> >
> > It then only took 2.14 seconds to transfer 1 GB of data.
> >
> > That's all for now.
>
> Thanks for all of your testing and numbers Bill.
>
> Inhong et al., we have to do something about this, the issue
> has been known and sitting around for weeks if not months.
>
> How safely can we set the default initial_ssthresh to zero in
> Cubic and BIC?
Yes. set it to zero. The module parameter could even go, and just
leave the route metric as a way to set/remember it.
next prev parent reply other threads:[~2007-06-13 0:16 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-07 0:37 2.6.20.7 TCP cubic (and bic) initial slow start way too slow? Bill Fink
2007-05-08 9:41 ` SANGTAE HA
2007-05-09 6:31 ` Bill Fink
2007-05-10 15:32 ` Bill Fink
2007-05-10 17:31 ` SANGTAE HA
2007-05-10 18:39 ` rhee
2007-05-10 20:35 ` David Miller
2007-05-10 20:45 ` Stephen Hemminger
2007-05-10 20:57 ` Injong Rhee
2007-05-12 16:07 ` Bill Fink
2007-05-12 16:45 ` SANGTAE HA
2007-05-16 6:44 ` Bill Fink
2007-06-12 22:12 ` David Miller
2007-06-13 0:16 ` Stephen Hemminger [this message]
2007-06-13 3:38 ` Bill Fink
2007-06-13 7:56 ` David Miller
2007-06-13 17:27 ` [PATCH] TCP: remove initial_ssthresh from Cubic Stephen Hemminger
2007-06-13 18:26 ` David Miller
2007-06-13 18:31 ` Stephen Hemminger
2007-06-13 18:46 ` David Miller
2007-06-14 4:03 ` Bill Fink
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