Terrible NFS4 performance: FreeBSD 9.1 + UFS/ZFS + AWS EC2

[Berend de Boer]

>>>>> "Rick" == Rick Macklem <rmacklem at uoguelph.ca> writes:

    Rick> I think you mentioned that you were using a Linux client,
    Rick> but not what version. I'd suggest a recent kernel from
    Rick> kernel.org. (Fedora tracks updates/fixes for NFSv4 pretty
    Rick> closely, so the newest Fedora release should be pretty
    Rick> current.)

This was Ubuntu 10.04 LTS.

Have just tried a FreeBSD 9.1 client. Similar numbers. NFSv3 is about
30% slower on FreeBSD than Linux: 3m30s versus 2m10s. NFSv4 has the
same terribly slow performance, i.e. 21m56s for the same test.

Interestingly, the nfsd cpu usage doesn't rise as high as with
Linux. But goes up to 20% (instead of over 50%).

I had a look at collectd measurements as well, one cpu on the FreeBSD
server is spending a lot of time in IRQ (whatever that means).

BTS, this was a FreeBSD NFS4 out-of-the-box server, not with the patch
(as the patch didn't do that much for me, it did some, but performance
was still 8 times slower than nfs3).


    Rick> All I can suggest is capturing packets and then emailing be
    Rick> the captured packet trace. You can use tcpdump to do the
    Rick> capture, since wireshark will understand it: # tcpdump -s 0
    Rick> -w <file>.pcap host <client-host> and then emailing me
    Rick> <file>.pcap.

    Rick> I can take a look at the packet capture and maybe see what
    Rick> is going on.

Will email them shortly.

--
All the best,

Berend de Boer


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