TCP Reassembly Issues

[Kris Bauer]

On Thu, Nov 24, 2011 at 4:06 PM, Stefan Bethke <stb at lassitu.de> wrote:

> Am 24.11.2011 um 21:30 schrieb Kris Bauer:
>
> > On Thu, Nov 24, 2011 at 1:20 PM, Raul <raul at turing.b2n.org> wrote:
> >
> > I am seeing the same sorts of things in netstat & vmstat:
> >
> > # netstat -s -p tcp |grep mem
> > 742935 discarded due to memory problems
> >
> > # vmstat -z |grep tcpreass
> > tcpreass: 40, 16464, 16340, 124, 131485,955443, 0
>
> Same here:
> root at diesel:~# netstat -s -p tcp |grep mem
>                529211 discarded due to memory problems
> root at diesel:~# vmstat -z |grep tcpreass
> tcpreass:                40,   1680,    1679,       1,  118846,831450,   0
> root at diesel:~# uname -a
> FreeBSD diesel.lassitu.de 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #20: Fri
> Nov 18 21:57:59 CET 2011     root at diesel.lassitu.de:/usr/obj/usr/src/sys/DIESEL
>  amd64
> root at diesel:~# uptime
> 11:01PM  up 5 days, 23:15, 1 user, load averages: 0.14, 0.04, 0.01
> root at diesel:~# svn info /usr/src
> Path: /usr/src
> Working Copy Root Path: /usr/src
> URL: http://mirror.hanse.de/svn/freebsd/base/stable/9
> Repository Root: http://mirror.hanse.de/svn/freebsd/base
> Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
> Revision: 227665
> Node Kind: directory
> Schedule: normal
> Last Changed Author: fabient
> Last Changed Rev: 227664
> Last Changed Date: 2011-11-18 15:41:48 +0100 (Fri, 18 Nov 2011)
>
> I regularly copy large files off my Tivo trans-atlantic (125ms RTT), and
> TCP connections currently stall after about 500 megs, never recovering.  I
> suspect this is connected, as it started immediately after upgrading the
> machine to 9-stable.
>
> As far as I can tell, the problem does not exist with 8-stable.
>
>
> Stefan
>
> --
> Stefan Bethke <stb at lassitu.de>   Fon +49 151 14070811
>
>
>
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100-150ms RTT trans-atlantic transfers is what I saw (largely) driving up
the reass.cursegments value.