more on the HFC saga
Marc Weinstein
mhw at fithp
Sat May 25 16:27:42 AEST 1991
>From article <1991May23.003857.8878 at blilly.UUCP>, by bruce at balilly (Bruce Lilly):
> In article <1991May22.041659.13189 at fithp> mhw at fithp (Marc Weinstein) writes:
>>
>>I'm beginning to think that there *ARE* select PCs out there which may
>>just be able to handle these higher throughputs. I know of at least
>>one 3b1 which can communicate with a Sun using V.42bis, 19200 port rate,
>>and sees ~1800 Bps with no data corruption.
>
> OK (remember, this is speculation, not hard facts): According to the
> Device Driver Development Guide, the last driver to be installed has its
> interrupt service routine(s) placed at the beginning of the interrupt
> "chain".
How do you reorder the devices drivers in the chain?
> I'm not sure how the built-in driver for /dev/tty000 is
> linked into the interrupt service chain, but that might be another
> pertinent factor.
Hmmm - we use tty000. We could switch to a combo board tty, but we
figured that tty000 *should* have the best response.
> Other possible factors are the version of the OS, hardware revision
> levels, kernel modifications
Has anyone seen any correlation with any ktune parameters??
> (such as the patch to speed up response to
> keyboard input, which might slow down response to tty interrupts),
We were under the impression that this patch was NOT just for keyboard
input, but was for ANY character I/O device. Is this not the case?
We could swear our tty I/O improved with the patch in place.
--
Marc Weinstein
{simon,royko,tellab5}!linac!fithp!mhw Elmhurst, IL
-or- {internet host}!linac.fnal.gov!fithp!mhw
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