Delays in connection to HP3000 via VT-MGR vs TELNET

[Pickering, John (NORBORD)]

Do you run Quick the same way in every case? With the Quick run time setting
of "READ=CHAR" even vt-mgr sessions will send each keystroke as a packet. If
you don't explicitly set the READ or LINEREAD parameter then the Quick udc
will attempt to alter it in some cases.

As for other sources of difference I think this question might be better
addressed to the 3000-L listserver (hp3000-l@raven.utc.edu). There's lots of
experts on that list who could answer telnet vs. vt-mgr vs. modem questions.
They'll be happy to tell you about an advanced version of telnet that should
improve things. And some of them even use PowerHouse!

Regards,
JWP

> -----Original Message-----
> From:	Bengt Johansson [SMTP:bengt.johansson@thoreb.se]
> Sent:	Wednesday, May 16, 2001 1:05 PM
> To:	'Powerhouse List Group'
> Subject:	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
>