need help: problem running win95 ppp at 33.6 on older 486

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4 total messages Started by tjf Sun, 16 Nov 1997 00:00

#228

Author: tjf
Date: Sun, 16 Nov 1997 00:00

52 lines
3387 bytes

I have a 486-33, at 8 MB with 1 MB SIMMs,
and probably destined to stay there:
looks like BIOS doesn't like 4 MB SIMMs.  It's an old
ASUS-TEK motherboard, 128K cache.  System has
two disks: one IDE, one SCSI.  IO board has the usual
two serial, one parallel port; no idea what its  jumpers do,
so I put the mouse on COM1 and left COM2 talking to air.
I put in a U.S. Robotics 33.6 internal modem, set its jumpers
for COM4 and IRQ 5, tested the modem with HyperTerminal,
configured the Win95 stack to talk to my ISP (pacbell),
and installed Netscape 3, News Express, and Eudora Lite.
Tested it: everything performed quite well.
Connections connect, packets flow, I can
surf the web, read news, and send mail.
Nice little Volkswagon on the information superhighway :-)

All great, except that when I'm receiving packets flat out at 33.6,
e.g. during a large file download or when fetching the news headers
from a high volume newsgroup, after a few hundred K
the packets stop flowing.  The cute simulated modem
lights on the task bar are glowing green, the download
stats are marching away, Netscape's ftp gives download
speeds at modem speeds or slightly higher, and then
suddenly the modem lights are red -- and at that point,
I can't get packets to flow from ANYTHING: ping,
web, anything.  However when I disconnect and reconnect,
everything is fine again.  And everything stays fine as
long as I don't do something that causes a lot of packets
to arrive at modem speeds.

I have found that lowering the modem speed to 14.4 (well,
setting the modem and comm port to 19.2) pretty much
makes this problem disappear.

I tried playing with the 16550 send/receive buffer settings;
doesn't seem to make any difference.

Is this a known problem with the Win95 stack?  Is there
a well known fix?  Patch from Microsoft?  Someone
else's stack?  Some parameter  to tweak?  I'll try anything.
Just don't want to be stuck at 14.4 on this box -- and
probably still unreliable, occasionally.

Any ideas welcomed!

Thanks,

-- Jon

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Re: need help: problem running win95 ppp at 33.6 on older 486

#229

Author: dan pellerin
Date: Mon, 17 Nov 1997 00:00

28 lines
2230 bytes

I believe that it has to do with the motherboard not being uart16650
compatible or something to that effect..  Can't remember off the top of my
head.  I think you will be stuck at 19.2k
dan


>All great, except that when I'm receiving packets flat out at 33.6,
>e.g. during a large file download or when fetching the news headers
>from a high volume newsgroup, after a few hundred K
>the packets stop flowing.  The cute simulated modem
>lights on the task bar are glowing green, the download
>stats are marching away, Netscape's ftp gives download
>speeds at modem speeds or slightly higher, and then
>suddenly the modem lights are red -- and at that point,
>I can't get packets to flow from ANYTHING: ping,
>web, anything.  However when I disconnect and reconnect,
>everything is fine again.  And everything stays fine as
>long as I don't do something that causes a lot of packets
>to arrive at modem speeds.
>
>I have found that lowering the modem speed to 14.4 (well,
>setting the modem and comm port to 19.2) pretty much
>makes this problem disappear.
>
>I tried playing with the 16550 send/receive buffer settings;
>doesn't seem to make any difference.
>

Re: need help: problem running win95 ppp at 33.6 on older 486

#230

Author: Frank Arnold
Date: Tue, 18 Nov 1997 00:00

23 lines
1712 bytes

There is a small freeware utility called MTUSpeed that
I found from a recommendation in Windows Magazine.
It seems to have given me considerable improvement,
your milage may vary.
http://www.mjs.u-net.com/mtuspeed/mtuspeed.htm
Frank Arnold
=================================
On Mon, 17 Nov 1997 20:38:30 -0600, "dan pellerin"
<danipell@sl.lakeheadu.ca> wrote:

>I believe that it has to do with the motherboard not being uart16650
>compatible or something to that effect..  Can't remember off the top of my
>head.  I think you will be stuck at 19.2k
>dan

>>
>>I tried playing with the 16550 send/receive buffer settings;
>>doesn't seem to make any difference.
>>
>
>
>

Re: need help: problem running win95 ppp at 33.6 on older 486

#231

Author: Eric Gisin
Date: Fri, 21 Nov 1997 00:00

21 lines
1851 bytes

In article <879732251.26486@dejanews.com>, tjf@pacbell.net says...
> I put in a U.S. Robotics 33.6 internal modem, set its jumpers
> for COM4 and IRQ 5, tested the modem with HyperTerminal,
> ,,,
> All great, except that when I'm receiving packets flat out at 33.6,
> e.g. during a large file download or when fetching the news headers
> from a high volume newsgroup, after a few hundred K ...
> suddenly the modem lights are red -- and at that point,
>...

I have heard of the flow stalling everytime a disk write occurs, but 
that's not your problem. Did you try the modem on COM3, IRQ not 5?
 
> Is this a known problem with the Win95 stack?  Is there

No, but try downloading DUN 1.2 from Microsoft anyway.

-- 
Eric Gisin, London.on.ca -- WinNT/UNIX/TCP/IP Consulting
http://www.webhaven.com/ericg/ mailto:ericg@techie.com

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