Re: [LARTC] new perflow rate control queue

[Wang Jian <lark@linux.net.cn>]

Hi Patrick McHardy,

HTB + SQF can only achieve part of funcionality.

Per flow rate control means per flow bandwidth assurance + bandwidth
constraint.

When we use HTB + SQF,

1. We can't achieve bandwidth assurance when flow count is higher than expected;
this often means we fail to meet the quality requirement.

2. We can't enforce bandwidth constraint when flow count is very low;
this often means waste of bandwidth.



On Mon, 04 Apr 2005 10:51:15 +0200, Patrick McHardy <kaber@trash.net> wrote:

> Wang Jian wrote:
> > Hi,
> > 
> > One of my customer needs per flow rate control, so I write one.
> > 
> > The code I post here is not finished, but it seems to work as expected.
> > 
> > The kernel patch is agains kernel 2.6.11, the iproute2 patch is against
> > iproute2-2.6.11-050314. 
> > 
> > I write the code in a hurry to meet deadline. There are many other things
> > to do ahead for me. The code is written in 2 days (including read other
> > queue's code) and tested for a while to find obvious mistake. Don't be
> > suprised when you find many many bugs.
> 
> It looks quite clean, but couldn't the same be achieved with just
> providing per-flow fairness and leaving the rate-limiting to an
> upper qdisc like HTB or HFSC?
> 
> Regards
> Patrick



-- 
  lark

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