On 12/11/12 01:00, scameron@xxxxxxxxxxxxxxxxxx wrote:
I tried using scsi_debug with fake_rw and also the scsi_ram driver that was recently posted to get some idea of what the maximum IOPS that could be pushed through the SCSI midlayer might be, and the numbers were a little disappointing (was getting around 150k iops with scsi_debug with reads and writes faked, and around 3x that with the block driver actually doing the i/o).
With which request size was that ? I see about 330K IOPS @ 4 KB and about 540K IOPS @ 512 bytes with the SRP protocol, a RAM disk at the target side, a single SCSI LUN and a single IB cable. These results have been obtained on a setup with low-end CPU's. Had you set rq_affinity to 2 in your tests ?
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