netdev - Re: HTB - very bad precision? HFSC works fine! 2.6.28

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Message-ID: <20090108092720.GC4496@ff.dom.local>
Date:	Thu, 8 Jan 2009 09:27:20 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Denys Fedoryschenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org
Subject: Re: HTB - very bad precision? HFSC works fine! 2.6.28

On 07-01-2009 23:02, Denys Fedoryschenko wrote:
> I notice that our uplink ISP complaining, that we are exceeding our UP rate.
> 
> I have configured at HTB 60Mbps, but he is actually receiving bursts up to 
> 64Mbps.
> 
> I tried to lower down HTB values to 57Mbps, and even on Cisco switch interface 
> counter(it is averaging 30 seconds of data i guess, to calculate bandwidth) - 
> it shows 60.1 - 60.4.
> 
> Funny thing, root class in HTB shows 57.1 - 57.3 Mbps. So maybe byte counting 
> is wrong in HTB?

Does this "2.6.28" in the subject mean it was better before or not
tested? Could you do a few snapshots with: tc -s qdisc show dev $DEV

> 
> I have also "default filter" 
> tc filter add dev ${DEV} parent 1:0 protocol ip prio 800 u32 match ip src 
> 0.0.0.0/0 flowid 1:50

I can see "tc qdisc add ... default 1000" in your config; is there a
class with this classid? Is there something in "direct_packets_stats"?
Maybe: "ethtool -k $DEV", BTW?

Jarek P.
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