Re: Why is NFSv4 so slow?



On Sun, 27 Jun 2010, Rick C. Petty wrote:

On Sun, Jun 27, 2010 at 08:04:28PM -0400, Rick Macklem wrote:

Weird, I don't see that here. The only thing I can think of is that the
experimental client/server will try to do I/O at the size of MAXBSIZE
by default, which might be causing a burst of traffic your net interface
can't keep up with. (This can be turned down to 32K via the
rsize=32768,wsize=32768 mount options. I found this necessary to avoid
abissmal performance on some Macs for the Mac OS X port.)

I just ran into the speed problem again after remounting. This time
I tried to do a "make buildworld" and make got stuck on [newnfsreq] for
ten minutes, with no other filesystem activity on either client or server.


Being stuck in "newnfsreq" means that it is trying to establish a TCP
connection with the server (again smells like some networking issue).

The file system corruption is still pretty bad. I can no longer build any
ports on one machine, because after the port is extracted, the config.sub
files are being filled with all zeros. It took me awhile to track this
down while trying to build devel/libtool22:


Assuming your mounts are not using "soft,intr", I can't explain the
corruption. Disabling delegations is the next step. (They aren't
required for correct behaviour and are disabled by default because
they are the "greenest" part of the implementation.)

rick

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