Hi Sage,
the performance improvment is quite impressive. Now I get around 90MB/s
from within the vm.
Thanks.
Best Regards,
martin
Sage Weil schrieb:
On Wed, 21 Sep 2011, Martin Mailand wrote:
Hi Sage,
good to hear that you are working on this issue. I tried qemu-kvm with the rbd
block device patch, which I think uses librbd, but I couldn't measure any
performance improvements.
Which versions do I have to use, and do I have to activate the writeback
window or is it default on?
In the qemu rbd: line, include an option like ":rbd_writeback_window=81920000",
where the size of the window is specified in bytes. (It's off by
default.)
Also, keep mind that unless you're using the latest qemu upstream (or our
repo), the flush aren't being passed down properly, and your data won't
quite be safe. (That's the main reason why we're leaving it off by
default for the time being.)
sage
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