[OmniOS-discuss] ping rtt for KVM in zone

[Matthew Lagoe]

Some nic's don’t handle the virtio stuff very well (myricom im looking at you) so that could be part of the problem

Intel typically is pretty good about it however so the e1000's working doesn’t surprise me.

What nics are you specifically having issues with that have the extra delay?

-----Original Message-----
From: OmniOS-discuss [mailto:omnios-discuss-bounces at lists.omniti.com] On Behalf Of Dominik Hassler
Sent: Wednesday, May 13, 2015 02:03 AM
To: omnios-discuss at lists.omniti.com
Subject: [OmniOS-discuss] ping rtt for KVM in zone

Hi,

I am running my KVMs in individual zones and seeing an increased ping rtt by a factor of approx. 7 compared to ping rtt when running the same KVM inside the GZ (cf. attached smokeping chart).

This does *only* affect virtio nics but not e1000 nics. For e1000 nics the ping rtt remains the same, no matter if the KVM runs in the GZ or a NGZ.

Dan's 'KVM Performance Update' did resolve the throughput issue, but not the strange ping behaviour I am seeing.

Any ideas why it only affects virtio nics and when the KVM is in a zone? Any ideas how to improve it?