On 10/15/2009 09:17 PM, Christoph Hellwig wrote:
So can we please get the detailed setup where this happens, that is:
Here's a setup where it doesn't happen (pwrite() + fdatasync() get to
the disk):
filesystem used in the guest
ext4
any volume manager / software raid used in the guest
lvm over one physical device
kernel version in the guest
2.6.30.8 (F11)
image format used
qcow2
qemu command line including caching mode, using ide/scsi/virtio, etc
-drive file=...,if=virtio
qemu/kvm version
qemu-kvm.git master
filesystem used in the host
ext4
any volume manager / software raid used in the host
lvm over one device
kernel version in the host
2.6.30.8 (F11)
So it seems this is no longer an issue, but may be an issue on older
setups. I suspect LVM as it used to swallow barriers.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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