Date: Thu, 24 Nov 2011 21:19:51 -0600 From: Kris Bauer <kristoph.bauer@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: "freebsd-stable@freebsd.org List" <freebsd-stable@freebsd.org> Subject: Re: TCP Reassembly Issues Message-ID: <CAPNZ-WraZo9FyvxRyuJ%2BnM2GPoSsqM99L--jOOX=h2VBrPFbHQ@mail.gmail.com> In-Reply-To: <20111125020004.GA36109@icarus.home.lan> References: <CAPNZ-Wq38=F3o2hYuYF_unBj3SZQ52XhVhdcwQ8PE_vU9xc2YA@mail.gmail.com> <CABLqceRyohFFYtdnW%2Bt%2B63kwk00cbkJVz3oXWqrR=xijkg14CA@mail.gmail.com> <4ECE9914.6020502@turing.b2n.org> <CAPNZ-WrQdjFEErt6K1uEndSc082q8Q48VHvtbP=5cNXFw7H7Rg@mail.gmail.com> <1A5B3A48-7DF3-4018-A244-152BDE96299A@lassitu.de> <CAJ-VmokMrJipptQWjuhY5-41p=-P2-xc3ze1p4JKTXWz3MgtzA@mail.gmail.com> <CAPNZ-Wr8r%2Bz7u%2BT3xgY3dfwhEZkN27NebrXzaXmXmneWpMw8xA@mail.gmail.com> <20111125020004.GA36109@icarus.home.lan>
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On Thu, Nov 24, 2011 at 8:00 PM, Jeremy Chadwick <freebsd@jdc.parodius.com>wrote: > On Thu, Nov 24, 2011 at 07:13:39PM -0600, Kris Bauer wrote: > > On Thu, Nov 24, 2011 at 5:35 PM, Adrian Chadd <adrian@freebsd.org> > wrote: > > > > > Have you tried disabling the tcp offload features of your NIC? > > > > > > > > > Adrian > > > > > > > To test this, I added net.inet.tcp.tso=0 to sysctl.conf and restarted the > > box; it didn't work. net.inet.tcp.reass.cursegments immediately started > > climbing up and were exhausted within an hour. > > I think Adrian was referring to RXCSUM and TXCSUM on your NIC; TSO is > another offloading feature. > > See ifconfig(8) for how to disable those. > > Be aware that disabling them in real-time (e.g. ifconfig xxx -rxcsum > -txcsum) may cause problems; there are some NIC drivers on FreeBSD which > do not like you doing this once the NIC has established link (meaning > "reloading the driver" (for lack of better term) results in wonky > behaviour). So you may instead want to add those hyphen-options to your > ifconfig_XXX lines in /etc/rc.conf and reboot the box. > > If none of this solves the problem, then I consider this a priority 0 > blocker (read: "all hands on deck") issue with the IP stack in FreeBSD > 9.x and will need immediate attention. > > I would strongly recommend a developer or clueful end-user begin > tracking down who committed all of these bits and CC them into the > thread. I would start by looking who implemented the > net.inet.tcp.reass.cursegments sysctl, because that isn't in RELENG_8 at > all. > > -- > | Jeremy Chadwick jdc at parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, US | > | Making life hard for others since 1977. PGP 4BD6C0CB | > > I have added -rxcsum -txcsum -tso to rc.conf and rebooted the box. This has not solved the problem. After a half-hour usage, I'm already up to reass.cursegments=2182 and it keeps climbing. Kris
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