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Old 04-21-2003, 10:34 PM   #1
Registered: Jan 2003
Posts: 56

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slow web browsing via modem

I'm finding that the transfer rate using Red Hat and Opera are about 1/3 the speed on the same sites when I use Windows and Opera. I already checked the modem init string, the problem is somewhere else. Compression / error connection is ON.

Will squid help? Any other suggestions?

Haven't tried ftp (I just got a new serial modem Linux plays nicely with a few days ago)

Old 04-22-2003, 02:50 PM   #2
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This is a 56k modem? Using Kppp?
Are you using the maximum speed between the modem and the pc, eg the port/connection speed setting?
Old 04-22-2003, 03:53 PM   #3
Registered: Jan 2003
Posts: 56

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using the Red Hat default GUI tools...

the port speed is set to 230K.

I think I know the real problem... the serial port priority needs to be set to highest in order to handle a modem connect. The recommended solution is:

============== quote
You probably need irqtune, if you are experiencing any of the following:

SLIP/PPP transfers seem slow. For example, using a 28.8 (or better) modem, the effective throughput is approximately 700 bytes/second instead of the expected 2500 bytes/second.

A running serial or SLIP/PPP connection is slow, drops data, hangs, or times out.

Netscape hangs mysteriously or stalls when trying to access a web page.

Equivalent serial/PPP programs under Windoze run much faster than under Linux.

Disk accesses seem to interfere with SLIP/PPP.

Interrupt handlers for specialized, time critical devices don't get control when they need to.
---------------------- end quote

Further research says that irqtune doesn't work with the 2.4.x kernel even though the results of running it show as working. I verified this by trying it, it returns OK and makes no difference. Know of any other tools to set the interrupt priority of a serial port, or where to go in the kernel to recompile it to tell it that the serial port needs max priority?
Old 04-26-2003, 04:46 AM   #4
Registered: Jan 2003
Posts: 56

Original Poster
Rep: Reputation: 15
as it turned out...

The MTU setting was wrong. Changed it to MTU=576 (finally gave up on trying to use the configurator) in the right cua file and... it works. Thanks anyway...


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