[Bloat] Bad shaping at low rates, after commit 56b765b79 (htb: improved accuracy at high rates)

[Eric Dumazet]

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 !