Re: sync guest calls made async on host - SQLite performance

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On Wed, Oct 14, 2009 at 05:54:23PM -0500, Anthony Liguori wrote:
> >Historically it didn't and the only safe way to use virtio was in
> >cache=writethrough mode.
> 
> Which should be the default on Ubuntu's kvm that this report is 
> concerned with so I'm a bit confused.

So can we please get the detailed setup where this happens, that is:

filesystem used in the guest
any volume manager / software raid used in the guest
kernel version in the guest
image format used
qemu command line including caching mode, using ide/scsi/virtio, etc
qemu/kvm version
filesystem used in the host
any volume manager / software raid used in the host
kernel version in the host


> Avi's patch is a performance optimization, not a correctness issue?

It could actually minimally degrade performace.  For the existing
filesystems as upper layer it doesn not improve correctness either.

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