[LARTC] new perflow rate control queue

[Andy Furniss]

Wang Jian wrote:
> Hi Andy Furniss,
> 
> 
> On Mon, 04 Apr 2005 16:23:30 +0100, Andy Furniss <andy.furniss at dsl.pipex.com> wrote:
> 
> 
>>>Because this per-flow queue is new, you can add things useful to it.
>>
>>It does look good :-) I'll test when I get time.
>>
> 
> 
> The attached is the latest. The last one doesn't sync time: queue has a
> variable time slot length; every flow has it own ticks.
> 
> This new patch against 2.6.11 sync queue and flows' time. Every new flow
> has it jiffies set to q->jiffies and use that as start. As q->jiffies
> and flow->jiffies increament in HZ step, time is synced. This will
> improved accuracy.
> 
> But HZ is too long for token calculation. Sometimes, one of flow borrows
> too much and get no enough penalty, so another flow hurts. But anyway,
> per flow queue provides better fairness in my test, either in
> short time period or long time period.
> 
> Looking forward to your feedback :)

It works OK for me - though I would really need it to be variable rate 
to use really - but as you say it's designed for your needs.

I noticed that it drops icmp so you need to be careful about what you 
send to it.

If you limit connections and use them all up then alive but not always 
active connections will get locked out - there is a netfilter connection 
limit already.

As you say above it's not always fair - I didn't test that much it 
seemed OK apart from if htb limited it ie.

htb rate higher than sum of rates but less than sum of ceils made it 
unfair to a flow with smaller packet size.

Andy.