Strange things on GBit / 1000->100 / net.inet.tcp.inflight.*

Raphael H. Becker rabe at p-i-n.com
Fri Sep 17 14:19:25 PDT 2004


On Fri, Sep 17, 2004 at 02:48:21PM +0200, Andre Oppermann wrote:
> "Raphael H. Becker" wrote:
> > My guess: The 5.3-Boxes send bigger TCP-Windows than our switch has
> > buffer for each port resulting in massive packetloss or something like
> > that. The sender is "too fast" for the switch or the switch isn't able
> > to convert from 1000MBit to 100MBit under heavy load
> > (store&forward-buffer)
> 
> Could you send me the output of (after you have run the 1000->100 test):
> 
>  # sysctl net.inet.tcp
>  # sysctl net.inet.tcp.hostcache.list
>  # netstat -s -p tcp
>  # netstat -s -p ip

http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_before.txt
http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_after.txt

wget:
Length: 1,160,773,632 (unauthoritative)
 1% [               ] 12,199,080   383.23K/s    ETA 48:46^C
 
HTH
Raphael Becker


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