Anthony Liguori wrote: > Laurent Vivier wrote: >> Anthony Liguori wrote: >> Hi Anthony, >> >> I didn't modify aio_init limit... >> > > It would be pretty useful to give it a try. In qemu_aio_init() where > aio_init() get's called. If you just bump aio_threads and aio_num from > 1 to, say, 32. You should see a big difference in SCSI performance. >
I made some tests as you explained, but results are worst.
with:
ai.aio_threads = 32;
ai.aio_num = 32;
I have:
KVM-25 + SCSI + aio_init(32 threads)
Throughput 332.305 MB/sec 1 procs
Throughput 316.832 MB/sec 2 procs
Throughput 246.741 MB/sec 4 procs
Throughput 142.115 MB/sec 8 procs
Throughput 107.227 MB/sec 16 procs
Throughput 54.6614 MB/sec 32 proc
Throughput 21.3738 MB/sec 64 procs
Laurent
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