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Date: Tue, 6 Jan 2009 12:25:07 +0800
From: "Lin Jui-Nan Eric" <ericlin@tamama.org>
To: "Robert Watson" <rwatson@freebsd.org>
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Cc: freebsd-net@freebsd.org, stable@freebsd.org
Subject: Re: TCP packet out-of-order problem
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Hi Robert,

I thought that the system auto-tune improperly in this case.

On Mon, Jan 5, 2009 at 9:13 PM, Robert Watson <rwatson@freebsd.org> wrote:
> On Fri, 2 Jan 2009, Lin Jui-Nan Eric wrote:
>
>> After running "netstat -s -p tcp", we found that lots of packets are
>> discarded due to memory problems. We googled for it, and found that sysctl
>> oid "net.inet.tcp.reass.maxsegments" became 0, therefore packets never
>> reassembled.
>>
>> Then we checked our /boot/loader.conf and /etc/sysctl.conf, and found that
>> setting kern.ipc.nmbclusters="0" makes net.inet.tcp.reass.maxsegments=0.
>> After setting net.inet.tcp.reass.maxsegments="1600" in /boot/loader.conf,
>> the network works perfectly now.
>
> Was it set to 0 through a configuration error, or did the system auto-tune
> improperly?
>
> Robert N M Watson
> Computer Laboratory
> University of Cambridge
>
>>
>> Thank you all for the help!
>> _______________________________________________
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>