Hello,
I'm not aware of any rule, but if you adjust the bandwith parameter
correctly
the tx-ring-limit seems to reflect that adjustment.
In my experience on low speed links/PVCs tx-ring-limit of 2 or 3 was
OK.
Just an idea: think about the delay/jitter as a function of
tx-ring-limit: the higher
the ring-limit is, the later the QoS takes place. If you have a ring
limit of 10, than
10 packets of max MTU could be 'sitting' in the hw FIFO without
triggering the QoS meachanism.
Given the bit rate of the line/PVC it gives you a time.
Someone from Cisco might correct me if i'm wrong...
regards,
--Zoltan
-----Eredeti üzenet-----
Feladó: Francois Baligant [mailto:francois@be.wanadoo.com]
Küldve: 2001. november 8. 3:44
Címzett: cisco-nsp@puck.nether.net
Tárgy: [nsp] tx-ring-limit tuning on ATM PVC
As anyone a mathematical method to tune the tx-ring-limit
parameter on an ATM PVC ?
Right now Im using a packet generator and checking if Im
dropping packets with 'sh queuing int atmx/x.x' when the
PVC is slighty full.
I would like to keep the tx-ring-limit as low as possible
to be able to do low latency queuing for some particular
QoS class.
I must pass all my traffic throught one PVC on that ATM
sub-interface. I have applied a policy-map to the PVC
to choose what I want to drop first of course.
Francois
--Francois Baligant _ Wanadoo Belgium NV/SA, Network Operation Center ( ) a subsidiary of France Telecom /_\/ Lozenberg 22 - B-1932 Zaventem francois@be.wanadoo.com (__/\ tel: +32 2 717 17 17 FB1-6BONE FB3122-RIPE fax: +32 2 717 17 77
- "if you hold a unix shell to your ear, do you hear the c?"
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