> On Mon, Mar 2, 2009 at 15:35, Anthony Liguori <anthony@xxxxxxxxxxxxx> wrote: >> Malinka Rellikwodahs wrote: >>> >>> Host: 2.6.27-gentoo-r8 AMD Opteron 2378 >>> Guest: Windows XP SP2 >>> >>> when running with a raw disk image as a file or a raw disk image on an >>> lvm vg, I'm getting very low performance on write (5-10 MB/s) however >>> when using qcow2 format disk image the write speed is much better >>> (~30MB/s), which is consistant with a very similar setup running >>> kvm-68. Unfortunately when running the test with qcow2 the system >>> becomes unresponsive for a brief time during the test. >>> >>> kvm -localtime -m 1024 -drive file=<diskimage>,boot=on >>> >>> where diskimage is either the qcow2 format image, or the path to the lv >>> >> >> What version of kvm is this? Is it kvm-68? You'll have better luck with >> something newer than that. kvm-83 is the one with the problem, kvm-68 is working correctly. >> >> Regards, >> >> Anthony Liguori >> >>> The host is running raid5 and drbd (drive replication software), >>> however performance on the host is performaning well and avoiding the >>> drbd layer in the guest does not improve performance, but running on >>> qcow2 does. >>> >>> Any thoughts/suggestions of what could be wrong or what to do to fix this? >>> -- >>> To unsubscribe from this list: send the line "unsubscribe kvm" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >> >> > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
