On 04/15/2011 11:23 AM, Badari Pulavarty wrote:
On Fri, 2011-04-15 at 17:34 +0200, Christoph Hellwig wrote:
On Fri, Apr 15, 2011 at 04:26:41PM +0100, Stefan Hajnoczi wrote:
On Fri, Apr 15, 2011 at 4:05 PM, Christoph Hellwig<h...@lst.de> wrote:
NAK. ?Just wait for the bloody NFS client fix to get in instead of
adding crap like that.
That's totally fine if NFS client will be fixed in the near future but
this doesn't seem likely:
http://www.spinics.net/lists/linux-nfs/msg20462.html
The code to use preadv/pwritev has been in qemu for over 2 years,
and it took people to notice the NFS slowdown until now, so don't
expect it to be fixed three days layer.
True. That brings up a different question - whether we are doing
enough testing on mainline QEMU :(
The issue here is NFS, not QEMU. Moreover, the real problem is that
we're using O_DIRECT. O_DIRECT seems to result in nothing but problems
and it never seems to be tested well on any file system.
I think the fundamental problem we keep running into really boils down
to O_DIRECT being a second class interface within Linux.
Regards,
Anthony Liguori
