tcp failing to recover from a packet loss under 8.2-RELEASE?

[Steven Hartland]

----- Original Message ----- 
From: "Steven Hartland"
> I look forward to hearing peoples thoughts on what the actual fix
> should be: increased default nmbclusters, decreased nmbclusters =>
> maxsegments divisor, or something else?

Another useful piece of information is that even though maxsegments
is set as a read only tuneable, it can be changed on the fly by
changing kern.ipc.nmbclusters, which seems a bit strange tbh, so
possibly an oversight there somewhere.

Example:-

sysctl net.inet.tcp.reass.maxsegments=16464
sysctl: oid 'net.inet.tcp.reass.maxsegments' is a read only tunable
sysctl: Tunable values are set in /boot/loader.conf

sysctl net.inet.tcp.reass.maxsegments
net.inet.tcp.reass.maxsegments: 1680

sysctl kern.ipc.nmbclusters=262144
kern.ipc.nmbclusters: 25600 -> 262144

sysctl net.inet.tcp.reass.maxsegments
net.inet.tcp.reass.maxsegments: 16464

    Regards
    Steve

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