[ofa-general] ***SPAM*** UD latency higher than RC on AMD quad core blades with ConnectX?

[Tziporet Koren]

Drake Samson wrote:
> Hello IB people,
>
> I set up an AMD dual quad-core system recently and ran some IB level 
> tests. The "ibv_ud_pingpong" and "ibv_rc_pingpong" tests show pretty 
> different results for UD vs RC (latency is more than double!). I'm 
> wondering if someone could shed light on the issue? Is there something 
> that needs to be updated or changed? Has someone else noticed this 
> phenomena?
>
I suggest you to use the performance utilities to measure performance:
ib_send_bw and ib_send_lat - for RC & UD send
ib_write_bw and ib_write_lat  - for RDMA

Tziporet