I'm using DPDK with a Mellanox ConnectX-3. Performance is quite good but I was wondering if it is possible to enable extended tag to increase performance for small packets ?
In DPDK docs (5. Enabling Additional Functionality — DPDK 2.2.0-rc0 documentation) some addresses are specified to be used with setpci but I am not sure if these are the same on the Mellanox Card ?
Furthermore, I cant seem to change the data on those addresses even if I wanted to ;-)
Using the config option in DPDK does not seem to yield a performance difference... probably because it only applies to adapters using the igb_uio driver.
I have successfully changed the max read request using setpci and register 68.w... So my question is: Is there a similar way to enable extended tag ?
ConnectX-3 adapters do not support extended tag. Extended tag is supported on ConnectX-4 / Lx and Connect-IB.