Il 09/08/2012 14:08, Stefan Priebe - Profihost AG ha scritto: > > virtio-scsi: > rand 4k: > write: io=822448KB, bw=82228KB/s, iops=20557, runt= 10002msec > read : io=950920KB, bw=94694KB/s, iops=23673, runt= 10042msec > seq: > write: io=2436MB, bw=231312KB/s, iops=56, runt= 10784msec > read : io=3248MB, bw=313799KB/s, iops=76, runt= 10599msec > > virtio-blk: > rand 4k: > write: io=896472KB, bw=89051KB/s, iops=22262, runt= 10067msec > read : io=1710MB, bw=175073KB/s, iops=43768, runt= 10002msec > seq: > write: io=4008MB, bw=391285KB/s, iops=95, runt= 10489msec > read : io=5748MB, bw=570178KB/s, iops=139, runt= 10323msec
Thanks; some overhead is expected, but not this much. Especially the sequential case is bad, what disk is this? Things to test include: - using the deadline I/O scheduler on at least the host, and possibly the guest too - running perf on the guest and the host (separately) to get profiles Paolo
