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Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS
From: |
Badari Pulavarty |
Subject: |
Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS |
Date: |
Fri, 15 Apr 2011 09:23:54 -0700 |
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 <address@hidden> 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 :(
> I can't event see you in the relevent threads arguing for getting it
> fixed, so don't complain.
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.
Thanks,
Badari
- [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Stefan Hajnoczi, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Christoph Hellwig, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Stefan Hajnoczi, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS,
Badari Pulavarty <=
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Christoph Hellwig, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Badari Pulavarty, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Anthony Liguori, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Badari Pulavarty, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Christoph Hellwig, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Stefan Hajnoczi, 2011/04/16
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Christoph Hellwig, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Anthony Liguori, 2011/04/15
- Re: [Qemu-devel] [PATCH] raw-posix: Linearize direct I/O on Linux NFS, Badari Pulavarty, 2011/04/15