Date: Fri, 25 Nov 2011 13:01:33 +1100 From: Lawrence Stewart <lstewart@freebsd.org> To: Kris Bauer <kristoph.bauer@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: TCP Reassembly Issues Message-ID: <4ECEF6FD.5050006@freebsd.org> In-Reply-To: <CAPNZ-Wq38=F3o2hYuYF_unBj3SZQ52XhVhdcwQ8PE_vU9xc2YA@mail.gmail.com> References: <CAPNZ-Wq38=F3o2hYuYF_unBj3SZQ52XhVhdcwQ8PE_vU9xc2YA@mail.gmail.com>
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On 11/24/11 18:02, Kris Bauer wrote: > Hello, > > I am currently experiencing an issue with FreeBSD 9.0-RC2 r227852 where the > net.inet.tcp.reass.curesegments value is constantly increasing (and not > descreasing when there is nominal traffic with the box). It is causing tcp > slowdowns as described with kern/155407: > > Exhausted net.inet.tcp.reass.maxsegments block recovering tcp session (for > this socket and any other socket waiting for retransmited packets). After > exhausted net.inet.tcp.reass.maxsegments allocation new entry in tcp_reass > failed (for this socket and any other socket waiting for retransmited > packets). > > I have increased the reass.maxsegments value to 16384 to temporarily avoid > the problem, but the cursegments number keeps rising and it seems it will > occur again. > > Is this an issue that anyone else has seen? I can provide more information > if need be. Thanks Kris, Raul and Stefan for the reports, I'll look into this. Cheers, Lawrence
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