netdev - HTB accuracy on 10GbE

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Date:	Mon, 2 Nov 2009 16:22:16 +0900
From:	Ryousei Takano <ryousei@...il.com>
To:	shemminger@...tta.com
Cc:	Linux Netdev List <netdev@...r.kernel.org>,
	takano-ryousei@...t.go.jp
Subject: HTB accuracy on 10GbE

Hi Stephen and all,

I have observed a HTB accuracy problem on the Linux kernel 2.6.30 and
the Myri-10G 10 GbE NIC.
HTB can control the transmission rate at Gigabit speed, however it can
not work well at 10 Gigabit speed.

I asked Stephen this problem at Japan Linux Symposium.  He mentioned a
HTB bug related to the timer granularity.
I want to know what is happen, and what should be do for fixing it.

Any comments and suggestions will be welcome.

For more detail, please see the following page:
http://code.google.com/p/pspacer/wiki/HTBon10GbE

Best regards,
Ryousei
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