Summary: TCP/IP settings

From: <Paf7172_at_aol.com>
Date: Mon Jun 03 2002 - 08:07:29 EDT
Thanks everyone.  



http://www.samag.com/documents/s=1323/sam0110e/0110e.htm


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http://www.rvs.uni-hannover.de/people/voeckler/tune/EN/tune.html

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Try a netstat -i to see if you have any interface errors. Check to see if
there are errors or a duplex speed mismatch by checking these settings on
the switch that you are connected to. The error your getting is a TCP error
but if the lower levels of networking aren't configured proeprly it could
cause timeots and a hit on performance. By correcting speed/duplex
mismatches on my switch i got our sites down from 5 second pageloads to 1.25
and collectively they get more than 1 million hits a month.

-----------------------
There are some tuning hints for websphere on Solaris at:

http://www-3.ibm.com/software/webservers/appserv/doc/v30/se/as3stmsb.html#Head

er_67

I would definitely consider exploring setting your device to hard-coded 100 
full-duplex if possible.  Talk with your network administrator to make sure 
you are plugged into a switch which is capable of full-duplex mode, then run 
through the following:

# ndd -set /dev/hme adv_10fdx_cap 0                <-- don't use 10 full 
duplex
# ndd -set /dev/hme adv_10hdx_cap 0                <-- don't use 10 half 
duplex
# ndd -set /dev/hme adv_100hdx_cap 0          <-- don't use 100 half duplex
# ndd -set /dev/hme adv_100fdx_cap 1      <-- DO use 100 full duplex
# ndd -set /dev/hme adv_autoneg_cap 0    <-- don't use auto-negotiation

Note that the last ndd above will cause the hme interface to reset, causing a 
temporary network outage.  You'll also want to make sure that the interface 
on the switch is hard-set to 100/full as well, auto-negotiation is bad on 
either end.

Also, did you make sure to set the tcp_conn_req_max_q on system startup?  
Parameters set with ndd will not persist across reboot, they must be set on 
startup every time (typically via an initialization script under /etc/rc*.d).
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Received on Mon Jun 3 08:12:51 2002

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