On Oct 23, 2012, at 2:36 AM, Rick Macklem <rmack...@uoguelph.ca> wrote:
> Ivan Voras 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. > > Oh, I realized that, if you are testing 9/stable (and not head), that > you won't have r227809. Without that, all reads on a given file will > be serialized, because the server will acquire an exclusive lock on > the vnode. > > The patch for r227809 in head is at: > http://people.freebsd.org/~rmacklem/lkshared.patch > This should apply fine to a 9 system (but not 8.n), I think. > > Good luck with it and have fun, rick > >> _______________________________________________ >> freebsd-hackers@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to >> "freebsd-hackers-unsubscr...@freebsd.org" Thanks, I've applied the patch by hand because of some differences and I'm now rebuilding. In case they are still needed here are the "dd" tests with loopback UDP mount : http://home.totalterror.net/freebsd/nfstest/udp-dd.html Over udp writing degrades much worse... _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
