Re: [Openstack-operators] [Openstack] UDP Buffer Filling

[Liping Mao (limao)]

> We already tune these values in the VM. Would you suggest tuning them on the 
> compute nodes as well?
No need on compute nodes.(AFAIK)


How much pps your vm need to handle?
You can monitor CPU usage ,especially si to see where may drop. If you see 
vhost almost reach to 100% CPU ,multi queue may help in some case.

Thanks.

Regards,
Liping Mao

> 在 2017年7月28日，22:45，John Petrini  写道：
> 
> We already tune these values in the VM. Would you suggest tuning them on the 
> compute nodes as well?
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[Openstack] UDP Buffer Filling

[John Petrini]

Hi List,

We are running Mitaka with VLAN provider networking. We've recently
encountered a problem where the UDP receive queue on instances is filling
up and we begin dropping packets. Moving instances out of OpenStack onto
bare metal resolves the issue completely.

These instances are running asterisk which should be pulling these packets
off the queue but it appears to be falling behind no matter the resources
we give it.

We can't seem to pin down a reason why we would see this behavior in KVM
but not on metal. I'm hoping someone on the list might have some insight or
ideas.

Thank You,

John
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