Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS

[Christoph Hellwig]

On Fri, Apr 15, 2011 at 09:23:54AM -0700, Badari Pulavarty wrote:
> True. That brings up a different question - whether we are doing
> enough testing on mainline QEMU :(

It seems you're clearly not doing enough testing on any qemu.  Even
the RHEL6 qemu has had preadv/pwritev since the first beta.

> I asked Stefan to work on a QEMU patch - since my QEMU skills are
> limited and Stefan is more appropriate person to deal with QEMU :)
> 
> As mentioned earlier, we don't see performance with any temporary
> solutions suggested so far (RPC table slot + ASYNC) comes anywhere
> close to readv/writev support patch or linearized QEMU.

So push harder for the real patch.  I haven't seen a clear NAK from
Trond, just that he'd like to avoid it.  For extra brownie points get
him release his read/write rework and integrate it with that.