[sheepdog-users] Concern about sheepdog performance

Liu Yuan namei.unix at gmail.com
Wed Dec 19 19:09:15 CET 2012

On 12/19/2012 12:30 AM, Valerio Pachera wrote:
> 13M/s (dd with oflag=direct)

This should be much better. I found that QEMU would issue FLUSH to
sheepdog even no object cache enabled. This will hurt write performance
a lot.

I will send a patch for QEMU to eliminate unnecessary FLUSH request
without object cache enabled or start up QEMU VM as 'cache=directsync |
none | off' even with object cache enabled on sheep daemon side.

All these fixes might be included in next stable QEMU release.


More information about the sheepdog-users mailing list