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From: John Heffner <jheffner@psc.edu>
To: Daniel Drake <dsd@gentoo.org>
Cc: Stephen Hemminger <shemminger@osdl.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: 2.6.17 regression: Very slow net transfer from some hosts
Date: Tue, 11 Apr 2006 20:32:12 -0400	[thread overview]
Message-ID: <443C4A8C.8070407@psc.edu> (raw)
In-Reply-To: <443C4471.7040407@gentoo.org>

Daniel Drake wrote:
> Stephen Hemminger wrote:
>> Turn off TCP window scaling, your performance will be limited but about
>> as good as you can get with a corrupting firewall in between.

[snip]

> For anyone else interested, the ISP is NTL (UK). The fix:
> 
>     echo "4096    16384   131072 " > /proc/sys/net/ipv4/tcp_wmem
>     echo "4096    87380   174760 " > /proc/sys/net/ipv4/tcp_rmem

For the record, I think Stephen's suggested workaround is better:

echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

It will prevent the other end of the connection from using a window 
scale, so it "fixes" both directions of the connection, not just receiving.

Thanks,
   -John

  parent reply	other threads:[~2006-04-12  0:32 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-11 19:30 2.6.17 regression: Very slow net transfer from some hosts Daniel Drake
2006-04-11 19:21 ` Stephen Hemminger
2006-04-11 19:23 ` John Heffner
2006-04-11 20:03   ` Daniel Drake
2006-04-11 19:55     ` John Heffner
2006-04-11 20:53       ` Daniel Drake
2006-04-11 20:54         ` John Heffner
2006-04-11 22:20           ` Daniel Drake
2006-04-11 22:33             ` Stephen Hemminger
2006-04-12  0:06               ` Daniel Drake
2006-04-11 23:59                 ` Stephen Hemminger
2006-04-12  0:32                 ` John Heffner [this message]
2006-04-12  0:42                 ` John Heffner

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