From: Andi Kleen <ak@muc.de>
To: Maciej Soltysiak <solt@dns.toxicfilms.tv>
Cc: linux-kernel@vger.kernel.org
Subject: Re: tcp_window_scaling degrades performance
Date: Thu, 15 Jul 2004 20:00:08 +0200 [thread overview]
Message-ID: <m3zn615exj.fsf@averell.firstfloor.org> (raw)
In-Reply-To: <2igbK-82L-13@gated-at.bofh.it> (Maciej Soltysiak's message of "Thu, 15 Jul 2004 17:20:08 +0200")
Maciej Soltysiak <solt@dns.toxicfilms.tv> writes:
> I have been experiencied weird problems with network throughput
> lately and I after experimenting with /proc/sys/net/ipv4 knobs
> I found that when I have tcp_window_scaling 0 I can
> get throughput from a distant server of about 600kB/s (well, 200kB/s
> is fast enough)
It's pretty easy for you to find out. Do a tcpdump -v or ethereal -v
from both the side of a host you download from and from the linux side.
Then compare all packets. If they don't match the firewall is
doing something bad. Especially check window values and TCP options
in the SYN packets
It is very very likely the firewall, window scaling works for a lot
of people.
-Andi
next parent reply other threads:[~2004-07-15 18:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2igbK-82L-13@gated-at.bofh.it>
2004-07-15 18:00 ` Andi Kleen [this message]
2004-07-16 10:21 ` Re[2]: tcp_window_scaling degrades performance Maciej Soltysiak
2004-07-16 14:01 ` Re[3]: " Maciej Soltysiak
2004-07-20 2:18 ` David S. Miller
[not found] ` <200407160726.39026.edt@aei.ca>
2004-07-19 18:13 ` [partially solved] " Maciej Soltysiak
2004-07-15 15:09 Maciej Soltysiak
2004-07-15 15:21 ` Kasper Sandberg
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