Re: [LARTC] HTB latency

2004-06-09 Thread miller69 
 tc qdisc add dev ethX parent HTBCLASS handle QDISC pfifo limit 10
Thanks guys, reducing the queue length to 10 packets the delay decreased
from about 2600ms (2.6 seconds) to 80ms. That helps a lot!

Regards

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[LARTC] HTB latency

2004-06-01 Thread miller69 
Hi list,

playing around with HTB showed that it may introduces pretty much latency
for our setup. Docum.org says the following:

The default qdisc added to a htb class is pfifo_fast qdisc. The size of the
qdisc is the device queue length and this is 100 packets for an ethernet
device. So if you want to have a shorter queue, you have to add a shorter
qdisc to the htb qdisc.

Can someone point me how to reduce this queue length or wich else qdisc I
can use to improve latency? All I need is a short queue in addition to the
shaping accuracy of HTB. Things like SFQ don't help. CBQ is a bit faster but
 far more inaccurate.

Thanks for any help!

Regards

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Re: [LARTC] HTB latency

2004-06-01 Thread Marton Sandor 
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Hi, 
 Can someone point me how to reduce this queue length or wich else qdisc I
 can use to improve latency? All I need is a short queue in addition to the
 shaping accuracy of HTB. Things like SFQ don't help. CBQ is a bit faster but
  far more inaccurate.

tc qdisc add dev ethX parent HTBCLASS handle QDISC pfifo limit 10
HTBCLASS - parent class (like 1:10)
QDISC - id of the new qdisc (like 10:0 )

will add the 10: pfifo qdisc with a queue length of 10 packets.

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