netdev - Re: tbf/htb qdisc limitations

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Date:	Tue, 19 Oct 2010 03:37:24 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Rick Jones <rick.jones2@...com>,
	Steven Brudenell <steven.brudenell@...il.com>,
	netdev@...r.kernel.org
Subject: Re: tbf/htb qdisc limitations

On Sun, 17 Oct 2010, Jarek Poplawski wrote:

> On Sat, Oct 16, 2010 at 09:24:34PM -0400, Bill Fink wrote:
> > On Sat, 16 Oct 2010, Jarek Poplawski wrote:
> ...
> > > http://code.google.com/p/pspacer/wiki/HTBon10GbE
> > >  
> > > If it doesn't help reconsider hfsc.
> > 
> > Thanks for the link.  From his results, it appears you can
> > get better accuracy by keeping TSO/GSO enabled and upping
> > the tc mtu parameter to 64000.  I will have to try that out.
> 
> Sure, but you have to remember that scheduler doesn't know real packet
> sizes and rate tables are less accurate especially for smaller packets,
> so it depends on conditions.

On my testing on the real data path, TSO/GSO enabled did seem
to give more accurate results for a single stream.  But when
I tried multiple 10-GigE paths simultaneously, each with a
single stream across it, non-TSO/GSO seemed to fare better
overall.

						-Bill
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