Sv: Delays in connection to HP3000 via VT-MGR vs TELNET

[Bengt Johansson]

Hi again everybody !

I have tested the advices. ( Thank you for them ! ) First only ( in the UDC: ) QUICK;LINEREAD=YES, then both QUICK;LINEREAD=YES; and TERM=HP2392-X25; and also READ="LINE", ( from the beginning there was 'QUICK;LINEREAD=NO; and TERM=HP2392-192-B-ANY' ), but I am sorry to say that nothing helped. There are still the same delays.
I have now addressed the suggested HP 3000-L listserver (hp3000-l@raven.utc.edu) with the same question. ( Thank you, John Pickering, for that tip. )
I will report back to you if they have a solution.

Best regards
Bengt Johansson


"Ole Hansen, ScanConsult" skrev:

> Hi Bengt,
>
> In addition to John Pickering's explanation of READ=CHAR vs. LINEREAD, I recall having similar problems, when we first connected remote sites over X.25-connections. At the advice of Cognos we changed our startup-command to:
>
> QUICK;LINEREAD=YES;TERM=HP2392-X25; etc.
>
> Now that we use Internet-borne connections instead, we still have TERM=HP2392-X25 (not because we did some clever thinking, but we didn't change anything, and had no problems when we switched). Maybe somebody at Cognos may want to comment on the significance of TERM in this context.
>
> Slightly off topic, we have noticed another peculiarity when running PowerHouse screens over 'long' connections (internet or satelite links). We have a few screens that run WHILE RETRIEVING statements and does a lot of spin-off processing, a.o. some RUN COMMAND statements, but with no display activity (i.e. no DISPLAY or INFORM verbs). These screens run 5-10 times slower over 'long' connections than when run over a local network. We have observed, that even if the screen is not changing its appearance, there is a lot of network traffic during the spin-off processing, i.e. a lot of packets are exchanged between QUICK on the HP3000 and Reflection on the PC - thus causing the slower response we think.
>
> Best regards
> Ole Hansen
>
> ====================================================================
> E-mail: oh@scanconsult.dk                Cell Phone: +45 40 40 11 50
> ====================================================================
> ScanConsult IT-Partners ApS                Voice   : +45 87 38 74 74
> Jegstrupvej 96A                            Fax     : +45 87 38 74 75
> DK-8361 Hasselager                  Support : support@scanconsult.dk
> Denmark                             Sales   :   sales@scanconsult.dk
>                      http://www.scanconsult.dk
> ===     ParaSuite :  A Suite of Air Cargo Handling solutions     ===
> ===     ParaSafe  :  A Suite of IT-Security solutions            ===
> ===  We partner with  Hewlett-Packard, Cognos, Lotus and others  ===
>
> -----Oprindelig meddelelse-----
> Fra: Bengt Johansson <bengt.johansson@thoreb.se>
> Til: 'Powerhouse List Group' <powerh-l@lists.swau.edu>
> Dato: 16. maj 2001 19:10
> Emne: Delays in connection to HP3000 via VT-MGR vs TELNET
>
> >Hi everybody !
> >
> >This question is not pure PowerHouse but it shows up when using
> >PowerHouse.
> >
> >We have an HP3000 at our office in Gothenburg and our customers are
> >spread out all over Sweden. Our customers mostly connects to the HP3000
> >using the Internet, but when there are problems with Internet or their
> >local network they all have a lifeline using the old technique with
> >direct telephone modem ( 19200 bps ), and that is always working.
> >
> >When using Internet our customers use either the VT-MGR or the TELNET
> >protocoll in 'Connection Setup' in Reflection.
> >Some customers never have problems ( and that is good ).
> >But some customers almost always have problems ( and that is no good ),
> >and so have I myself sometimes when connecting from my home i Halmstad,
> >where I also have an office.
> >
> >When using TELNET there are sometimes delays for every character sent. I
> >myself have seen delays up to 15 seconds but one customer have seen
> >delays up to 40 seconds.
> >This delay is from having pressed one button till the character pops up
> >at the screen.
> >Very annoying.
> >When using TELNET every character ( plus 40 extra characters ), when
> >pressing the button, are sent as a package from the user, to the HP3000
> >and then back to the user before the character pops up at the screen.
> >This TELNET delay became a bit shorter = better ( but not good enough )
> >after having changed 'Retransmission Interval Lower Bound' from default
> >4 seconds to 1 second in NETXPORT.GPROT.TCP in NMMGR.
> >
> >Now to the question:
> >When using VT-MGR there is ALWAYS a delay in some PowerHouse Quick
> >screens, especially one heavily used screen with a primary file and a
> >detail file with many occurrancies and much data on the screen in Find
> >Mode after having read one set of data from having pressed Return to get
> >the next set of data till the new data pops up at the screen.
> >>From home with my relatively slow Internet connection this delay is
> >always 13 seconds with VT-MGR in this screen filled with data.
> >Using TELNET this delay is only between 1 and 2 seconds, but as I said
> >TELNET sometimes is too slow in another way.
> >Inside our office in Gothenburg with a fast LAN ( 100 Mbit/sec ) the
> >same screen gives a delay between 4 and 5 seconds with VT-MGR ( when the
> >TELNET delay is under 1 second ), and that is too much isn't it ? And
> >the 13 seconds mentioned above I can't stand. Would you ?
> >When using common MPE commands like LISTF or other, there are no delays
> >at all inside the fast LAN neither with VT-MGR nor TELNET, so why when
> >using PowerHouse ?
> >
> >When using VT-MGR every pressed button is echoed to the screen locally
> >and there is a package sent to the HP3000 only when Return is pressed,
> >so this protocoll should be more efficient, but at least in PowerHouse
> >it seems not to be so efficiant.
> >
> >Does anyone know a prescription to solve this problem ?
> >Some of my customers hate these delays so much that they use the
> >telephone modem instead of Internet, and have to pay the telephone cost
> >for that, when Internet is free when you have a fixed connection.
> >I have asked HP Support, but they have not given me any solution yet.
> >
> >Another queer question is why some other customers NEVER have problems
> >using TELNET.
> >
> >We use MPE 6.0 and  PowerHouse 8.29.D3.
> >
> >Best regards
> >Bengt Johansson
> >AB Thoreb
> >