On Sat, 7 Nov 1998, eric_repec wrote:
> 3 gig WD IDE HD
> external best data v.90 modem (note: dial in is 33.6 so it is running @
> 115200)
> serial card has 16C550 uart
> The system seems to work fine most of the time but downloads seem to
> slow down
Every download or just some?
> and I checked ifconfig and it said that the ppp0 device was getting a
> lot (500+ over 2 hours) errors and dropped packets on the RX. I am out
> of ideas as to what to tweek to get this to work. Please help.
Offhand it sounds like an interrupt (or io port or DMA?) conflict. Check
that no other device is sharing the interrupt your modem uses; if another
device like a mouse is using the same interrupt, you'll get errors
whenever that device generates an interrupt. A common, nasty situation
is with ATI video cards and COM4.
But if errors only occur during downloads, there is another possibility.
For safety, the IDE driver masks other interrupts while it is talking to
the hard drive (i.e., while it is saving the data you're downloading)
which can cause serial port overruns. You can unmask interrupts with
"hdparm -u 1 ...". Read the hdparm man page carefully before trying this,
though, especially the portions that mention "MASSIVE FILESYSTEM
CORRUPTION", and back up your data and stress test your system with the
new settings before saving anything else important to your hard drive.
Ed
--
Ed Doolittle <mailto:[EMAIL PROTECTED]>
"Everything we do, we do for a reason." -- Peter O'Chiese
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