On 9/10/2013 6:42 PM, Barney Cordoba wrote: > NFS has been broken since Day 1, so lets not come to conclusions about > anything > as it relates to NFS.
iSCSI is NFS ? ---Mike > > BC > > ------------------------------------------------------------------------ > *From:* Mike Tancsa <m...@sentex.net> > *To:* Rick Macklem <rmack...@uoguelph.ca> > *Cc:* FreeBSD Net <n...@freebsd.org>; David Wolfskill <da...@catwhisker.org> > *Sent:* Wednesday, September 4, 2013 11:26 AM > *Subject:* TSO help or hindrance ? (was Re: TSO and FreeBSD vs Linux) > > On 9/4/2013 8:50 AM, Rick Macklem wrote: >> David Wolfskill wrote: >>> >>> >>> I noticed that when I tried to write files to NFS, I could write >>> small >>> files OK, but larger ones seemed to ... hang. >>> * "ifconfig -v em0" showed flags TSO4 & VLAN_HWTSO turned on. >>> * "sysctl net.inet.tcp.tso" showed "1" -- enabled. >>> >>> As soon as I issued "sudo net.inet.tcp.tso=0" ... the copy worked >>> without >>> a hitch or a whine. And I was able to copy all 117709618 bytes, not >>> just >>> 2097152 (2^21). >>> >>> Is the above expected? It came rather as a surprise to me. >>> >> Not surprising to me, I'm afraid. When there are serious NFS problems >> like this, it is often caused by a network fabric issue and broken >> TSO is at the top of the list w.r.t. cause. > > > I was just experimenting a bit with iSCSI via FreeNAS and was a little > disappointed at the speeds I was getting. So, I tried disabling tso on > both boxes and it did seem to speed things up a bit. Data and testing > methods attached in a txt file. > > I did 3 cases. > > Just boot up FreeNAS and the initiator without tweaks. That had the > worst performance. > disable tso on the nic as well as via sysctl on both boxes. That had the > best performance. > re-enable tso on both boxes. That had better performance than the first > case, but still not as good as totally disabling it. I am guessing > something is not quite being re-enabled properly ? But its different > than the other two cases ?!? > > tgt is FreeNAS-9.1.1-RELEASE-x64 (a752d35) and initiator is r254328 9.2 > AMD64 > > The FreeNAS box has 16G of RAM, so the file is being served out of cache > as gstat shows no activity when sending out the file > > > > ---Mike > > > -- > ------------------- > Mike Tancsa, tel +1 519 651 3400 > Sentex Communications, m...@sentex.net <mailto:m...@sentex.net> > Providing Internet services since 1994 www.sentex.net > Cambridge, Ontario Canada http://www.tancsa.com/ > > _______________________________________________ > freebsd-net@freebsd.org <mailto:freebsd-net@freebsd.org> mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org > <mailto:freebsd-net-unsubscr...@freebsd.org>" > -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, m...@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/ _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"