On Oct 20, 2012, at 3:11 PM, Ivan Voras <ivo...@freebsd.org> wrote:
> On 20 October 2012 13:42, Nikolay Denev <nde...@gmail.com> wrote:
>
>> Here are the results from testing both patches :
>> http://home.totalterror.net/freebsd/nfstest/results.html
>> Both tests ran for about 14 hours ( a bit too much, but I wanted to compare
>> different zfs recordsize settings ),
>> and were done first after a fresh reboot.
>> The only noticeable difference seems to be much more context switches with
>> Ivan's patch.
>
> Thank you very much for your extensive testing!
>
> I don't know how to interpret the rise in context switches; as this is
> kernel code, I'd expect no context switches. I hope someone else can
> explain.
>
> But, you have also shown that my patch doesn't do any better than
> Rick's even on a fairly large configuration, so I don't think there's
> value in adding the extra complexity, and Rick knows NFS much better
> than I do.
>
> But there are a few things other than that I'm interested in: like why
> does your load average spike almost to 20-ties, and how come that with
> 24 drives in RAID-10 you only push through 600 MBit/s through the 10
> GBit/s Ethernet. Have you tested your drive setup locally (AESNI
> shouldn't be a bottleneck, you should be able to encrypt well into
> Gbyte/s range) and the network?
>
> If you have the time, could you repeat the tests but with a recent
> Samba server and a CIFS mount on the client side? This is probably not
> important, but I'm just curious of how would it perform on your
> machine.
The first iozone local run finished, I'll paste just the result here, and also
the same test over NFS for comparison:
(This is iozone doing 8k sized IO ops, on ZFS dataset with recordsize=8k)
NFS:
random random
bkwd record stride
KB reclen write rewrite read reread read write
read rewrite read
33554432 8 4973 5522 2930 2906 2908 3886
Local:
random random
bkwd record stride
KB reclen write rewrite read reread read write
read rewrite read
33554432 8 34740 41390 135442 142534 24992 12493
P.S.: I forgot to mention that the network is with 9K mtu.
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