On Aug 30, 2001 21:23 -0700, Kevin P. Fleming wrote:
> OK, I see that now... and it looks like the risks associated with setting
> the unmaskirq flags on my drives (none of the four drives have it set now)
> are too great to be worth playing with it. I'll just not use my PPP
> connection during these particularly heavy disk activity moments. Thanks for
> the quick response.
There was a kernel patch (or possibly a user-space tool) which allowed
one to change the "priority" of IRQs and their handlers. This was back
in the 1.2 or 2.0 days, when _any_ disk or other interrupt activity might
be enough to cause problems for serial connections (especially if you
only had a 16450 UART (1 byte buffer) instead of a 16550 (16 byte buffer).
You could make your serial interrupt (handler) take priority over disk
interrupts.
Maybe Ted Ts'o or other long-time Linux folks will know what was actually
called, and whether it is still applicable to modern hardware/kernel.
Cheers, Andreas
--
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:34 EST