On Thu, 21 Jan 2021 23:33:56 +0000
lejeczek via CentOS <centos@xxxxxxxxxx> wrote:
> Hi guys.
>
> Hoping some net experts my stumble upon this message, I have
> an IPoIB direct host to host connection and:
...
> > $ iperf3 -c 10.5.5.97
> [ ID] Interval Transfer Bitrate Retr
> [ 5] 0.00-10.00 sec 16.2 GBytes 13.9 Gbits/sec
> 0 sender
> [ 5] 0.00-10.00 sec 16.2 GBytes 13.9
> Gbits/sec receiver
>
> It's rather an oldish platform which hosts the link, PCIe is
> only 2.0 but with link of x8 that should be able to carry
> more than ~13Gbits/sec.
> Infiniband is Mellanox's ConnectX-3.
If you want to test the infiniband performance you ib_write_bw for
example not iperf.
IPoIB will always be quite a bit slower than native IB.
That said, if you want to optimize IPoIB for performance make sure
you're running connected mode not datagram mode.
/Peter
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