hi,all
I run winxp vm on Dell R710 server, used with LSI SAS 1068E
controller which is connected with one FUJITSU MBA3147RC disk(SAS, 15k
rpm, no raid setting), virtio-blk and aio=native is used, if I copy a
big file in VM, it displays about 3-5Mbps from iotop display.
I run dd in host, it can reach about 90Mbps.(dd if=/dev/zero
of=1.test bs=1M count=1024 oflag=direct);
if I run dd in FC14 vm with the same dd command, it can reach about 70Mbsp.
I then attach a SATA disk(ST31000528AS) with IDE/SATA contoller
(Intel 82801IB), winxp vm can reach about 30Mbps while copying a file
viewed from iotop.
the problem is: why winxp vm achive so slow disk-write performance
on a faster storage device? it seems the reasons come from: winxp
model of copying a file, and from different storage device.
Is there any tool or way to dig deeper into the problem, so that
it can get winxp vm to copy files normally?
BTW: I have tried with qemu-kvm 0.15 and kvm-kmod-3.0b, the result
remains the same.
thanks.
Suya.
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