X on sparc64?

[Kris Kennaway]

On Sat, Oct 11, 2003 at 07:48:37PM -0600, Tillman Hodgson wrote:
> On Sat, Oct 11, 2003 at 06:42:24PM -0700, Kris Kennaway wrote:
> > On Sat, Oct 11, 2003 at 07:38:36PM -0600, Tillman Hodgson wrote:
> > > On Sat, Oct 11, 2003 at 05:34:02PM -0700, Kris Kennaway wrote:
> > > > Be aware that 4.x's NFS code doesn't like talking to sparc64 clients -
> > > > it causes the i386 server to double fault.  5.x as a server is
> > > > perfectly happy though.
> > > 
> > > I have an Ultra 5 running a recent -current that uses an i386 -stable as
> > > it's NFS server ... I've never seen any problems with it. Is this an
> > > issue that is only affected via certain NFS options or is otherwise
> > > possible to (unknowingly) avoid?
> > 
> > It only occurs under load..if you've never put heavy (I mean heavy!)
> > loads on the server you've probably avoided it.  I was able to repeat
> > this on two separate networks.
> 
> Load on which end? I dump all filesystems on 4 servers to the -stable
> box out of daily.local (thus simultaneously), which should swamp the NFS
> server fairly regularly. 14 out of 16 of my nfsd's show significant CPU
> usage, considering that my uptime is 11 days (my last -stable upgrade).
> 
> I'm now somewhat nervous about the setup if you meant load on the NFS
> server rather than the sparc64 client :-)
> 

BTW, if you want to test this, a good way to try would be to build the
fsx tool in /usr/src/tools/regression/fsx, mount the i386 4.x machine
rw on the sparc64 and run a dozen or so instances concurrently for a
day or so (or until it blows up).  I haven't tried this, but fsx is
typically a good way to exercise filesystem bugs.

Kris
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