Network speeds?

[awedio]

Using tools like jperf, iperf etc. & http://www.starwindsoftware.com/forums/starwind-f5/tcp-stack-optimized-iscsi-settings-t792.html
What speeds should one expect to see (on a gigabit network)?

Does anyone have a testing methodology or routine they follow? (I have a 4 node Hyper-V cluster)
Looking for suggestions, so I can perform consistent & repeatable tests

femi

[Aitor_Ibarra]

I'm not convinced that iperf and hyper-v play nicely together. I would get different results each test, going from mediocre to abysmal and always consistently lower than I was seeing in more real-world tests (e.g. running tests against iSCSI targets, doing network copies etc). This was with 10Gbit/s, maybe it's more accurate with 1Gbit/s.

With hyper-v role installed, even the 'host' is a vm, although it's a more priviledged one. Maybe it wasn't hyper-v mucking around with the network stack, but the QoS driver. It was as if Windows was saying "oh, you're just running an iperf test, you don't really need the bandwidth". I prefer testing against a Starwind RAM disk, which did give me consistent results.

In theory, you should be able to get about 100MB/sec over 1Gbit/sec ethernet. In both directions at the same time.

[awedio]

I'm glad to know it's just not me.
The few iperf/jperf test I've run did not look very good, just "dog slow" results.

Thx for the heads up, I'll try testing across nodes with RAM disks.

[Constantin (staff)]

Aitor, thanks for help! )
Yes, speed should be about 700-900Mb/s