On 23/08/15 18:30, Robert Mustacchi wrote:
On 8/17/15 3:47 , Schmurfy wrote:
Hi,
We recently bought a HP DL120 G9 which appears to have an i350 network
card, we planned to use it as a SmartOS Host running kvm virtual machines
but we have weird behavior with the network.
What we see is high latency variation on load and occasional losses, when
sending pings to both the host (Smartos) and the KVM VM the latency for the
host is highly stable (below 3ms) with no loss while the VM results are
scary (up to 20ms latency with some losses).
To be sure I created a bare VM with nothing on it and left it durring the
weekend with a ping to it, the results are what I saw with the other VM:
high latency variation and losses (without any load on the Host or VM).
Is there any known issue with this card and KVM ? (it uses the igb driver),
does someone else successfully uses it ?
Hi,
We've used the i350 quite a lot in various generations of hardware;
however, we haven't been running it with KVM. The first thing you might
want to check is where the latency is coming from. Whether we're getting
backed up somewhere or something else is going on.
To do that, I might loook at DTracing through various parts of the MAC
stack and seeing what, if any hardware rings and fanout is being done in
MAC.
For techniques on how to do this kind of diagnosis, take a look at
https://smartos.org/bugview/OS-4008 where I did this for overlay
networks and take a look at
http://src.illumos.org/source/xref/illumos-gate/usr/src/uts/common/io/mac/mac_sched.c#29
which I wrote as part of doing the previous analysis to explain how the
data path works.
Robert
Hi,
What was outcome of this? Was the issue resolved and what was causing it
in the end?
I'd need to choose a 1GE NIC and currently I'm looking at i210 vs. i350.
--
-Jussi Sallinen
+358 40 700 7600
[email protected]
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