Not getting more than 65000 IOPS with xtreme setup

[stevecs]

when you're running xdd w/ >32 threads what is your output for vmstat 5 while that's running? likewise when you do a iostat -m -x 15 (looking for averages, in vmstat to see if you have more context switches than interrupts for example or what % is in i/o wait). iostat can be interesting for service time & utilization. Though I would like to see if you're able a xdd read test against your ram disk to make sure we're not seeing a top limit in xdd here.

oh, and noticed that the request size was wrong in the script it's set to 8 (that's actually the number times your block size which is 512bytes so it's testing 4096 bytes (1 page)) not your 8K that you wanted which would be a request size of 16. Shouldn't be much of a difference in numbers based on your earlier tests but to be aware.