Subject: Re: tbf/htb qdisc limitations

From: Bill Fink <[email-masked]>
Date: Tue, 19 Oct 2010 03:37:24 -0400

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