Rajouri Jammu wrote:
I have the following set both on rdma_connect as well as at rdma_accept.
conn_param.responder_resources = 4;
conn_param.initiator_depth = 4;
Should initiator_depth be lower for better behavior?
Higher values for those attributes means that more outstanding WR of
RDMA Read/Atomic will
be handled.
It doesn't matter which value you put in initiator_depth (for example:
1, 4) as long as it sync with the
responder_resources value.
Dotan
On Jan 9, 2008 10:16 PM, Dotan Barak < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Rajouri Jammu wrote:
> Occasionally, I'm getting a retry exceeded error on the qp
(error 12)
> when doing rdma_reads.
>
> Under what conditions would thins kind of problem happen?
>
> I have the retry_count = 5 and 'am using rdma_cm for all the
> connection setup.
>
> OFED version is 1.2.5
Does it happen between different HCAs?
If this happens during working with the QPs (not in the first message)
than check the following thing:
If the QP attributes values of max_rd_atomic and max_dest_rd_atomic
this may happen.
The values should be (for sides A and B):
A.max_rd_atomic <= B.max_dest_rd_atomic
A.max_dest_rd_atomic >= B.max_rd_atomic
(which means that RDMA Reads/atomic as initiator shouldn't be larger
than the supported value as the destination)
You can check it by query the used QP and verify those values.
If it happens at the beginning of the connection, there may be other
problem and i need more info ....
Dotan
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