Date: Sat, 22 Nov 2008 02:12:02 -0800 From: Julian Elischer <julian@elischer.org> To: Jason Fines <jason.fines@gmail.com> Cc: freebsd-virtualization@freebsd.org Subject: Re: Question About TCP Reassembly Inside VImages Message-ID: <4927DAF2.5040709@elischer.org> In-Reply-To: <5e6025b70811212019h64feb7dcrd02ab78ba1b558c3@mail.gmail.com> References: <5e6025b70811212019h64feb7dcrd02ab78ba1b558c3@mail.gmail.com>
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Jason Fines wrote: > Hello all, > > I've got a question about setting the sysctl variable > net.inet.tcp.reass.maxsegments to a non-zero value inside my vimages. I'm > currently running the FreeBSD 7 with the VIMAGE package available at > http://imunes.tel.fer.hr/virtnet/vimage_7-20081015.tgz. > > My problem is with TCP reassembly support inside of the vimages, namely with > the tcp.reass.maxsegments sysctl variable. I've tracked down where in the > code the variable is set to line 122 in tcp_reass_init() of > netinet/tcp_reass.c: "V_tcp_reass_maxseg = nmbclusters / 16;". The line > clearly reads that maxsegments should be set to "nmbclusters /16", in the > main OS (not in any vimage) the value is correctly set to 1/16 of what my > nmbclusters sysctl variable is set to. However, inside all my vimages > nmbclusters is set correctly, while reass.maxsegments is incorrectly set to > zero!!! V_tcp_reass_maxseg is a macro that hides the fact that tcp_reass_maxseg is a PER Vimage variable. Part of the patch is to make some sysctls be per-vimage. I do not know exactly about that one.. I suspect it is actually a read-only whole-system value, and not per vimage. > > Is it possible that nmbclusters when read on line 122 of netinet/tcp_reass.c > is zero? Has anyone else experienced this problem? Is TCP reassembly not > supported/tested inside vimages? > > Any help in this area would be greatly appreciated. > > Thanks, > Jason > > P.S. This technology is phenomenal, and thanks to everyone who is involved > developing it. > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebsd.org"
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