Shirley Ma wrote:
I just touch tested ofed-1.3 beta IPoIB. And found there was a kernel
parameter hw_csum being added in IPoIB. I have several questions here:
1. Why not using ethtool to set up these HW_CSUM flags?
This is experimental code - Dror explained it in OFED devcon (Or sent
you the pointer)
2. I haven't looked at the detailed code yet, is that possible with this
flag, TCP/IP will not do CSUM for HCA which has no TCP/IP offload support?
If so, then these packets should be limited to be IB network. Routing to
ethernet network, the packets would be dropped. If not, I tested IPoIB-UD,
why I saw 30% improvement with hw_csum set in none connectX mthca SDR
environment?
Arbel HCA also support checksum offload - so you will see improvement in
this HCA too.
3. I saw switching between IPoIB-cm and IPoIB-ud corrupted interface IP
address (unicast address, subnet mask, broadcast address. Anybody saw the
same problem?
Can you give more details? We change here between CM and UD mode all the
time.
What is the exact scenario you run?
Tziporet
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