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Date:      Fri, 04 Jul 2008 20:30:35 +0200
From:      Kris Kennaway <kris@FreeBSD.org>
To:        Hwa Hing <hwahing@smartteam.net>
Cc:        freebsd-performance@freebsd.org, David Kwan <david.kwan@isilon.com>
Subject:   Re: TCP stack in FreeBSD poor performance in 100MB to Gigabit	environment.
Message-ID:  <486E6C4B.6060902@FreeBSD.org>
In-Reply-To: <486AE678.8050206@smartteam.net>
References:  <E83E80FC158BCA4F921B1349E38866B802A6DD77@seaxch07.desktop.isilon.com> <486AE678.8050206@smartteam.net>

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Hwa Hing wrote:
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> 
> I also had such problem with FreeBSD-7 Stable-SMP with 4 port Intel
> 1GBit NIC em Driver and with Packet Filter, ALTQ enabled.

But it doesn't sound like you are testing the same thing at all.

> I tested with iperf from network a to network b. I found freebsd droping
> packets and the transfer speed in routed mode is only 2 mbit/s compare
> to linux router which able to forward the traffic at almost full speed.

Check that the software isn't making invalid Linux-specific assumptions 
about e.g. socket buffer sizes.

Kris




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