Re: [j-nsp] Output queue drops and temporal buffers

2013-10-04 Thread Christopher E. Brown
On 10/1/2013 11:12 AM, John Neiberger wrote: My question regarding the config is this: if we are already setting the transmit rate percentage, why would we also configure a temporal allocation? Isn't a percentage of the available bandwidth sufficient? What does adding a temporal allocation

[j-nsp] Output queue drops and temporal buffers

2013-10-01 Thread John Neiberger
I've been troubleshooting an interesting problem off and on the past couple of days. We have a 1-gig link that is consistently running around 10% utilization, give or take a couple of percent, but we see periods where the egress WRED drops for queue 0 spike. It's bizarre because there is no

Re: [j-nsp] Output queue drops and temporal buffers

2013-10-01 Thread Saku Ytti
On (2013-10-01 13:12 -0600), John Neiberger wrote: As I understand it, the formula to determine available buffer space is this: bandwidth * transmit-rate percent * temporal buffer size You are right. So they are not really temporal at all, temporal would imply that buffer is always 50ms,

Re: [j-nsp] Output queue drops and temporal buffers

2013-10-01 Thread david.roy
Hi We experienced unexpected drops with temporal buffer (which is a static buffer) and iCHIP based cards. It was in junos 11.4. Jtac had found an internal PR that matched our issue. Workaround was the using buffer-size in %. Which version and cards do you use? David Envoyé de mon iPad

Re: [j-nsp] Output queue drops and temporal buffers

2013-10-01 Thread John Neiberger
This particular router is running 9.6R4.4 (yeah, I know...) and the linecard is a DPCE-R-40GE-TX. Thanks to some prodding by someone else, I took a look at the drop profile configured and see that this queue will start WRED drops at 70%, which amounts to just 880 KB or so. I guess we must be