On Tue, Mar 01, 2016 at 11:00:11AM +0200, Sagi Grimberg wrote:
>
>>> + if (rdma_rw_use_mr(qp->device, port_num)) {
>>> + ret = rdma_rw_init_mr_wrs(ctx, qp, port_num, sg, sg_offset,
>>> + remote_addr, rkey, dir);
>>
>> At some point I would like the iWARP IO to do no-mr for WRITE/dma_nents
>> == 1, and WRITE/dma_nents <= max_send_sge for the device. I think this
>> will help smaller iSER/NVMEF READ IOPs. I'm testing this out now on the
>> NVMEF code, which is slightly different. If it proves out to better the
>> performance, I'll post a follow-on patch...
>
> Is this possible given that pd->local_dma_lkey has only local
> permissions?
I think he means NVMe / SCSI READ commands, which use RDMA WRITE.
For NVMe / SCSI WRITE commands that use RDMA READ all bets are off
for iWarp, but at least it supports READ W/ INVALIDATE.
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