Hello Bart,
On Tue, Apr 18, 2017 at 8:22 PM, Bart Van Assche
<Bart.VanAssche@xxxxxxxxxxx> wrote:
> On Tue, 2017-04-18 at 19:33 +0200, Roman Penyaev wrote:
>> By current email I would like to share some fresh RDMA performance
>> results of IBNBD, SCST and NVMEof, based on 4.10 kernel and variety
>> of configurations.
>
> Hello Roman,
>
> Thank you for having shared these results. But please do not expect me
> to have another look at IBNBD before the design bugs in the driver and
> also in the protocol get fixed.
I expected only that you might find results interesting, where I target
the following:
1) retest on latest kernel
2) compare against NVMEoF
3) retest using register_always=N
> The presentation during Vault 2017 made
> it clear that the driver does not scale if more than two CPUs submit I/O
> simultaneously at the initiator side.
On the iops graph, where I increase number of simultaneous fio jobs up to 128
(initiator has 64 CPUs), NVMEoF tends to repeat the same curve, staying always
below IBNBD. So even this is a scalability problem, it can be seen on NVMEoF
runs also. That's why I posted these results to draw someone's attention.
--
Roman
