netdev - 10GBE performance drop with net.ipv4.tcp

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Date:	Tue, 19 Jun 2012 23:08:03 +0200
From:	Stefan Priebe <s.priebe@...fihost.ag>
To:	Linux Netdev List <netdev@...r.kernel.org>
Subject: 10GBE performance drop with net.ipv4.tcp_timestamps=0

Hello List,

i'm testing 10GBE speed with tweo servers. One with 3.5-rc3 nd thoe 
other one whith RHEL 6 (2.6.32 kernel).

I noticed that setting
net.ipv4.tcp_timestamps=0

descreased the performance from 9,7 Full Duplex to 3-4Gb/s.

Is this bahviour fine? What should / could i tet?

Greets
Stefan
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