On 01/06/2015 13:16, Dmitry Monakhov wrote: > 259,0 31 385 0.719283423 10729 Q WS 29376775 + 248 [qemu-io] > 259,0 31 388 0.719287600 10729 Q WS 29377023 + 8 [qemu-io] > 259,0 31 391 0.719315193 10729 Q WS 29377031 + 248 [qemu-io] > 259,0 31 394 0.719319179 10729 Q WS 29377279 + 8 [qemu-io]
Compared to the old one: > 9,0 11 1 0.000000000 11151 Q WS 312737792 + 1023 [qemu-img] > 9,0 11 2 0.000007938 11151 Q WS 312738815 + 8 [qemu-img] > 9,0 11 3 0.000030735 11151 Q WS 312738823 + 1016 [qemu-img] > 9,0 11 4 0.000032482 11151 Q WS 312739839 + 8 [qemu-img] > 9,0 11 5 0.000041379 11151 Q WS 312739847 + 1016 [qemu-img] > 9,0 11 6 0.000042818 11151 Q WS 312740863 + 8 [qemu-img] > 9,0 11 7 0.000051236 11151 Q WS 312740871 + 1017 [qemu-img] I suspect the difference is that my patch avoids RMW operations on disks that have 512-byte logical blocks and 4K physical blocks. Paolo
