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

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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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