Hi folks, I did an IO performance test on the tcm-vhost scsi. I want to share
the test result data here.
seq-read seq-write rand-read rand-write
8k 256k 8k 256k 8k 256k 8k 256k
----------------------------------------------------------------------------
bare-metal 67951 69802 67064 67075 1758 29284 1969 26360
tcm-vhost-iblock 61501 66575 51775 67872 1011 22533 1851 28216
tcm-vhost-pscsi 66479 68191 50873 67547 1008 22523 1818 28304
virtio-blk 26284 66737 23373 65735 1724 28962 1805 27774
scsi-disk 36013 60289 46222 62527 1663 12992 1804 27670
unit: KB/s
seq-read/write = sequential read/write
rand-read/write = random read/write
8k,256k are blocksize of the IO
In tcm-vhost-iblock test, the emulate_write_cache attr was enabled.
In virtio-blk test, cache=none,aio=native were set.
In scsi-disk test, cache=none,aio=native were set, and LSI HBA was used.
I also tried to do the test with a scsi-generic LUN (pass through the
physical partition /dev/sgX device). But I couldn't setup it
successfully. It's a pity.
Benchmark tool: fio, with ioengine=aio,direct=1,iodepth=8 set for all tests.
kvm vm: 2 cpus and 2G ram
thanks.
Meng Cong.
--
To unsubscribe from this list: send the line "unsubscribe target-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
