Date: Fri, 25 Nov 2011 13:05:06 -0500 From: George Mitchell <george+freebsd@m5p.com> To: freebsd-stable@freebsd.org Subject: Re: TCP Reassembly Issues Message-ID: <4ECFD8D2.4030604@m5p.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 11/24/11 21:00, Jeremy Chadwick wrote: >[...] > 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. > I've tried out the 9.0 release candidates, and what I notice is that for a few minutes after the system starts, I get wonderful NFS read throughput (7+ MB/s over a 100 megabit interface) -- more than twice as fast as 7.n or 8.n on the same hardware -- quickly degrading to abysmal (less than 0.5 MB/s). Is this possibly related to the problem under discussion? -- George Mitchell P.S. A lot of other 9.0 features look very nice indeed!
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