Date: Sat, 23 Aug 2008 22:55:47 -0700 From: "Kip Macy" <kmacy@freebsd.org> To: "Julian Elischer" <julian@elischer.org> Cc: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>, freebsd-net@freebsd.org, Mike Tancsa <mike@sentex.net> Subject: Re: strange TCP issue on RELENG_7 Message-ID: <3c1674c90808232255s30a6fce7ma8e081e935a6adbc@mail.gmail.com> In-Reply-To: <48B0F722.3050005@elischer.org> 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>
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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
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