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тАО02-04-2005 02:46 AM
тАО02-04-2005 02:46 AM
TCPIP_speed vs DecNet_over_IP_speed
Experiments with IP window size or IP packets size only decrease speed (compared with standard parameters values) :))
I have only one idea - PWIP driver working not over SYS$QIO services, but uses more down level APIs... Isn`t it? If not, why this situation appears? And how to increase IP-netwoking perfomance with SYS$QIO service?
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тАО02-04-2005 03:11 AM
тАО02-04-2005 03:11 AM
Re: TCPIP_speed vs DecNet_over_IP_speed
DECnet basically provides a record oriented service (like the native VMS file system) rather than the byte stream service provied by TCP (like native unix file system).
When converting to use TCP rather than DECnet I found that I had to do more work to do the same things (this may be because I'm a VMS programmer not a unix programmer and therefore am not so familier with TCP socket networking).
What I mean is that the performance difference may be due to changes you did to get you application to work over IP.
Purely Personal Opinion
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тАО02-04-2005 03:17 AM
тАО02-04-2005 03:17 AM
Re: TCPIP_speed vs DecNet_over_IP_speed
There are many possibilities. What is CPU utilization on the processor running the application).
Another possibility, admittedly an interesting one, is that you are seeing the advantages of using a protocol which has records as an inherant property rather than the streams used in TCP. It is an interesting question as to the exact details of what is happening and where the performance is disappearing.
I hope that the above is helpful.
- Bob Gezelter, http://www.rlgsc.com
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тАО02-06-2005 04:56 PM
тАО02-06-2005 04:56 PM
Re: TCPIP_speed vs DecNet_over_IP_speed
Tim
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тАО02-07-2005 03:59 AM
тАО02-07-2005 03:59 AM
Re: TCPIP_speed vs DecNet_over_IP_speed
You could try setting TCP_NODELAY on the socket.