On Wed, Oct 7, 2009 at 11:53 AM, Matthew Tippett <tippettm@xxxxxxxxx> wrote:
> When you indicated that you had attempted to reproduce the problem, what
> mechanism did you use? Was it Karmic + KVM as the host and Karmic as
> the guest? What test did you use?
I ran the following in several places:
a) on the system running on real hardware,
time dd if=/dev/zero of=$HOME/foo bs=1M count=500
524288000 bytes (524 MB) copied, 9.72614 s, 53.9 MB/s
b) in an vm running on qemu-kvm-0.11 on Karmic
time dd if=/dev/zero of=$HOME/foo bs=1M count=500 oflag=direct
524288000 bytes (524 MB) copied, 31.6961 s, 16.5 MB/s
c) in a vm running on kvm-84 on Jaunty
time dd if=/dev/zero of=$HOME/foo bs=1M count=500 oflag=direct
524288000 bytes (524 MB) copied, 22.2169 s, 23.6 MB/s
Looking at the time it takes to write a 500MB file to a real hard
disk, and then inside of the VM. If I were to experience the problem
on Karmic, I would have seen this dd of a 500MB file take far, far
less time than it takes to write that file to disk on the real
hardware. This was not the case in my testing.
> I will re-open the launchpad bug if you believe it makes sense to
> continue the discussions there.
Please re-open the bug if you can describe a real test case that you
used to demonstrate the problem. Without being rude, it's hard for me
to work from a bug that says a magazine article says that there's a
bug in the Ubuntu distribution of qemu-kvm-0.11.
If you can provide clear steps that you have used to experience the
problem, then I will be able to take this issue seriously, reproduce
it myself, and develop a fix.
:-Dustin
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