netdev - HTB vs HFSC, HTB is highly inaccurate

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Date:	Sun, 8 Mar 2009 20:45:39 +0200
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: HTB vs HFSC, HTB is highly inaccurate

Hi again

I test again HTB and HFSC, this time in very simple case.

Regarding HTB - i try without quantum, with different values, without and with 
cburst (big and small), with HZ=1000 and default, hysteresis on and off - it 
is almost same result. 

While i set limit at 57, it can reach 61. HFSC results is perfect.

Here is graph snapshopts.
http://www.nuclearcat.com/netdev/htb-problem.png
You can see points where HTB enabled. Other points if HFSC.

Scripts source is:

HTB http://www.nuclearcat.com/netdev/htb-script.txt
HFSC http://www.nuclearcat.com/netdev/hfsc-script.txt

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