[driverloader] Re: [hsflinux] Modem dropping connection under high CPU load

[Linuxant support (Jonathan)]

Hi,

this is a known issue. The driver must process a lot of data that came from 
the modem and must do this operation in real time and since Linux is not a 
real time operating system, if there is excessive CPU loading that prevents 
the driver kernel thread from running at a regular interval, the connection 
will break.

As you suggested, you should try to use the 'nice' command on programs that 
might require a lot of CPU cycles to run.

Regards,


Jonathan
Technical specialist / Linuxant
www.linuxant.com
support at linuxant.com


On Sunday 06 June 2004 19:02, Richard Harwood wrote:
> Hi folks,
>
> Just wondering if anyone else has come across this problem.
>
> I have an HSF modem in a Dell Inspiron 5150 laptop and a registered copy of
> the modem drivers from Linuxant.
>
> Everything works well apart from the modem will drop the line often when
> the CPU load is high. "High" can be anything from just surfing a few web
> sites to running a niced-down distributed application in the background.
>
> This is with the latest HSF driver on the site. I'm tried this on an older
> kernel and a newer kernel and the results are about the same. I've tried
> tweaking every kernel parameter I can think of to improve matters but it
> makes no difference. I thought it may have to do with power management
> because the 5150 is notoriously bad at this. Anyway, I have the latest BIOS
> update from Dell on here too.
>
> The following gets logged in /var/log/messages when a hangup is about to
> occur:
>
> kernel: spurious 8259A interrupt: IRQ7.
> kernel: Conexant: TX FIFO UNDERRUN (Bus Latency) - FIFOE
>
> Any suggestions would be greatly appreciated!
>
> Richard
>
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