Date: Sat, 23 Aug 2008 23:18:43 -0700 From: Julian Elischer <julian@elischer.org> To: Kip Macy <kmacy@freebsd.org> Cc: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>, Mike Tancsa <mike@sentex.net>, freebsd-net@freebsd.org Subject: Re: strange TCP issue on RELENG_7 Message-ID: <48B0FD43.2090705@elischer.org> In-Reply-To: <3c1674c90808232305s42cc9187k58e195d5092261e1@mail.gmail.com> References: <200808221719.m7MHJY25090566@lava.sentex.ca> <20080822191146.T66593@maildrop.int.zabbadoz.net> <200808221922.m7MJMcUN091064@lava.sentex.ca> <3c1674c90808231916l2c92a8e4sae0f191af31b5870@mail.gmail.com> <200808240312.m7O3CZS0098145@lava.sentex.ca> <48B0F722.3050005@elischer.org> <3c1674c90808232255s30a6fce7ma8e081e935a6adbc@mail.gmail.com> <48B0F8AD.1090601@elischer.org> <3c1674c90808232305s42cc9187k58e195d5092261e1@mail.gmail.com>
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Kip Macy wrote: > Yes, he has the same issue. > -Kip > > > On Sat, Aug 23, 2008 at 10:59 PM, Julian Elischer <julian@elischer.org> wrote: >> Kip Macy wrote: >>> On Sat, Aug 23, 2008 at 10:52 PM, Julian Elischer <julian@elischer.org> >>> wrote: >>>> Mike Tancsa wrote: >>>>> At 10:16 PM 8/23/2008, Kip Macy wrote: >>>>>> Can you help me out a bit with your workload? >>>>>> >>>>>> tcp_offload_connect(...) needs to determine which interface an address >>>>>> corresponds to see if that interface supports TCP offload. The code >>>>>> does the exact same thing as ip_output does except it doesn't have the >>>>>> inpcb locked (which isn't used as part of the route lookup). >>>>> This is the only RELENG_7 box that I have where it routes tcp packets >>>>> asymmetrically, so that sounds like it might be the portion that is >>>>> badly >>>>> interacting. The server has just one default gateway, which is out em0, >>>>> but >>>>> clients all over the net will connect to IP addresses aliased on lo0 and >>>>> to >>>>> the one IP on em1. But all connections exit out em0 other than >>>>> connected >>>>> routes of course. >>>>> >>>>> ---Mike >>>>> >>>>>> Julian has worked in this code most recently, maybe he has some idea >>>>>> what is going on. >>>>>> >>>> huh? wha? I haven't been following this thread.. what's up? >>>> >>> Julian - see previous e-mails, the arp cache gets messed up as a >>> result of calling rtalloc in tcp_offload.c - which is done to >>> determine which interface will be used for connection. Any thoughts on >>> why it may end up with dozens of bogus entries? >>> >>> -Kip >> has anyone tried the same scenario on -current? ok so it might be related to the MRT code... I assume he only has one Routing table.. Theoretically it shoudl work the same as before if N==1 but I can imagine a case where it didn't. especially if arp and interffaces are involved.. Mike, can you give me a repro example? >> >> >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >>
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