Person, Roderick <[EMAIL PROTECTED]> wrote: [...] > been spending time upgrading hardway. I aquired a 33.6 3Com > external modem. Quite a boost from my old 14.4...I quess If I did > get so many F#$ CRC errors.
I found that my USR Courier did exactly the same thing - lots of suspicious PPP errors which went away if I lowered the port speed to below 9600. It turned out to be lost interrupts. It sounds like you have the same problem. I've seen three culprits for this one: 1) You've got a slow/buggy UART on your I/O card. It should be a 16550A or better. You can tell what kind you have by running "setserial /dev/ttySx" (x for your port numbe) as root. If it says 8250, 16450, you should buy another one. 2) You have an IRQ conflict. "cat /proc/interrupts", and check they're all where you expect them to be. This is quite likely the case if your modem is on /dev/ttyS[23] and you've got a lot of other cards. 3) The one I've not seen documented elsewhere: hdparm. I originally used hdparm on my old 486 to speed up my disk accesses by enabling 32 bit accesses and multiple mode. Alas, multiple mode hogged the bus, so every time I accessed the disk, I'd lose serial interrupts. Using "-u1" here fixed this. *WARNING*: some motherboards don't like this, like my current Pentium one, and may trash the disk (as I discovered the hard way.) -- Peter Corlett, Many-hatted BOFH, tw2.com Limited. use Standard::Disclaimer qw/Not my employer's opinion/;
