> > This is probably the change to cache=writethrough. I bet if you set
> > cache=writeback then you'll see this go away.
>
> cache=writeback is only slightly faster, like going from 6MB/s to 7MB/s.
ignore that remark, I retested with cache=writeback and everything is OK
again. I must have mis
ons 2008-11-19 klockan 12:26 -0600 skrev Anthony Liguori:
> Ryan Harper wrote:
> > * Henrik Holst <[EMAIL PROTECTED]> [2008-11-18 08:42]:
> >
> >> The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2
> >> images by an order of 10. If one got 60MB/s before, one gets around
> >> 6M
Would this affect 'qemu-img commit'? It took over an hour to commit
a fresh install of Vista on a qcow2 virtual disk. (The base image
expanded from 3GB to 11GB, which is a lot of committing, though.)
Yes.
Regards,
Anthony Liguori
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Anthony Liguori wrote:
Ryan Harper wrote:
* Henrik Holst <[EMAIL PROTECTED]> [2008-11-18 08:42]:
The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2
images by an order of 10. If one got 60MB/s before, one gets around
6MB/s with 78 and 79 (measured with dd)
dd command?
what's
Thomas Mueller wrote:
On Wed, 19 Nov 2008 12:26:41 -0600, Anthony Liguori wrote:
This is probably the change to cache=writethrough. I bet if you set
cache=writeback then you'll see this go away.
this was it. cache=writeback and the throughput goes from 10mb/s to 80/mb/
s with if=scsi
On Wed, 19 Nov 2008 12:26:41 -0600, Anthony Liguori wrote:
> Ryan Harper wrote:
>> * Henrik Holst <[EMAIL PROTECTED]> [2008-11-18 08:42]:
>>
>>> The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2
>>> images by an order of 10. If one got 60MB/s before, one gets around
>>> 6MB/s
Ryan Harper wrote:
* Henrik Holst <[EMAIL PROTECTED]> [2008-11-18 08:42]:
The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2
images by an order of 10. If one got 60MB/s before, one gets around
6MB/s with 78 and 79 (measured with dd)
dd command?
what's your -drive par
* Henrik Holst <[EMAIL PROTECTED]> [2008-11-18 08:42]:
> The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2
> images by an order of 10. If one got 60MB/s before, one gets around
> 6MB/s with 78 and 79 (measured with dd)
dd command?
what's your -drive parameters look like, specif
On Tue, 18 Nov 2008 15:39:52 +0100, Henrik Holst wrote:
> The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2
> images by an order of 10. If one got 60MB/s before, one gets around
> 6MB/s with 78 and 79 (measured with dd)
so i'm not the only one facing this problem.
- Thomas
-
The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2
images by an order of 10. If one got 60MB/s before, one gets around
6MB/s with 78 and 79 (measured with dd)
Replacing qemu with the one bundled in kvm-77 solves this regression.
I have tested all the cache= options to -drive wit
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