netdev - Re: Bad shaping at low rates, after commit 56b765b79 (htb: improved accuracy at high rates)

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Date:	Tue, 04 Jun 2013 08:18:53 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	Jiri Benc <jbenc@...hat.com>, David Miller <davem@...hat.com>,
	j.vimal@...il.com, Michal Soltys <soltys@....info>,
	Mike Frysinger <vapier@...too.org>,
	Jussi Kivilinna <jussi.kivilinna@...et.fi>,
	Patrick McHardy <kaber@...sh.net>,
	Jiri Pirko <jpirko@...hat.com>,
	Toke Høiland-Jørgensen <toke@...e.dk>,
	Dave Taht <dave.taht@...il.com>, netdev@...r.kernel.org,
	bloat@...ts.bufferbloat.net, Dan Siemon <dan@...erfire.com>,
	Jim Gettys <jg@...edesktop.org>,
	Steven Barth <cyrus@...nwrt.org>, Felix Fietkau <nbd@....name>
Subject: Re: Bad shaping at low rates, after commit 56b765b79 (htb: improved
 accuracy at high rates)

On Tue, 2013-06-04 at 14:13 +0200, Jesper Dangaard Brouer wrote:
> Hi again,
> 
> I found another regression by commit 56b765b79 (htb: improved accuracy
> at high rates).
> 
> After the commit HTB does not honor network rate limiting below 500kbps.
> 
> I have found that the bandwidth problem is related to GSO being enabled
> on the device.  To test the situation, I had to use a real NIC (as I
> were not allowed to disable GSO on dev "lo", test below).

Well, do not forget lo mtu is 64K, so you'll also have to lower it for
your tests.

I have a good idea of what's going on for htb at low rates, I am testing
a fix, thanks for the report !


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