netdev - Re: Possible regression in HTB

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Date:	Wed, 8 Oct 2008 11:10:56 +1100
From:	Simon Horman <horms@...ge.net.au>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Martin Devera <devik@....cz>, Patrick McHardy <kaber@...sh.net>
Subject: Re: Possible regression in HTB

On Tue, Oct 07, 2008 at 12:20:52PM +0000, Jarek Poplawski wrote:
> On Tue, Oct 07, 2008 at 03:51:47PM +1100, Simon Horman wrote:
> > On Tue, Oct 07, 2008 at 12:15:52PM +1100, Simon Horman wrote:
> > > Hi Dave, Hi Jarek,
> > > 
> > > I know that you guys were/are playing around a lot in here, but
> > > unfortunately I think that "pkt_sched: Always use q->requeue in
> > > dev_requeue_skb()" (f0876520b0b721bedafd9cec3b1b0624ae566eee) has
> > > introduced a performance regression for HTB.
> 
> Since this looks to me as possibly theoretical problem I added
> Martin and Patrick to Cc.
> 
> > > 
> > > My tc rules are below, but in a nutshell I have 3 leaf classes.
> > > One with a rate of 500Mbit/s and the other two with 100Mbit/s.
> > > The ceiling for all classes is 1Gb/s and that is also both
> > > the rate and ceiling for the parent class.
> > > 
> > >                           [ rate=1Gbit/s ]
> > >                           [ ceil=1Gbit/s ]
> > >                                  |
> > >             +--------------------+--------------------+
> > >             |                    |                    |
> > >      [ rate=500Mbit/s ]   [ rate=100Mbit/s ]   [ rate=100Mbit/s ]
> > >      [ ceil=  1Gbit/s ]   [ ceil=100Mbit/s ]   [ ceil=  1Gbit/s ]
> 
> ?!       [ ceil=  1Gbit/s ]   [ ceil=1Gbit/s ]     [ ceil=  1Gbit/s ]

Sorry, you are correct. ceil=1Gbit/s for all leaf-nodes is correct.
ceil=100Mbit/s was a cut and paste error.

-- 
Simon Horman
  VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
  H: www.vergenet.net/~horms/             W: www.valinux.co.jp/en

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