Kurt Yoder wrote:
I see. I looked up another test: using hdparm -t. It doesn't show the
situation as quite so bad, but the guest is still a little over half
the speed of the host:
m...@host:~$ sudo hdparm -t /dev/mapper/HW_RAID-ROOT
/dev/mapper/HW_RAID-ROOT:
Timing buffered disk reads: 282 MB in 3.00 seconds = 93.92 MB/sec
m...@guest:~# hdparm -t /dev/vda
/dev/vda:
Timing buffered disk reads: 156 MB in 3.03 seconds = 51.56 MB/sec
This is reasonable. IDE emulation is not expected to be as fast as the
host.
Something weird is happening with your system. If you extend the
test, what does 'top' show? On both guest and host.
If I extend the test thusly on the guest:
dd if=/dev/zero of=/bigfile count=10000000
I see 100% CPU utilization on the guest, and 100% CPU utilization on
one of the host cores.
Can you post 'vmstat 1' snippets on both guest and host while this is
running?
Oh, and try switching to the deadline I/O scheduler on the host instead
of the default cfq.
--
error compiling committee.c: too many arguments to function
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