Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!uwvax!umn-d-ub!nic.MR.NET!shamash!nis!ems!rosevax!cimcor!mike
From: mike@cimcor.mn.org (Michael Grenier)
Newsgroups: comp.unix.microport
Subject: Re: Losing interrupts?
Message-ID: <592@cimcor.mn.org>
Date: 6 Oct 88 02:42:09 GMT
References: <1905@van-bc.UUCP>
Organization: Grenier & friends, Forest Lake, MN
Lines: 21

From article <1905@van-bc.UUCP>, by sl@van-bc.UUCP (pri=-10 Stuart Lynne):
! For example one of the basic differences between SCO 386 and the SysV 386 
! products is the priority of the interrupts.
! 
! 	SCO			SysV
!   SPL7	Serial		SPL7	Clock
!   SPL6	Clock		SPLTTY	Serial
! 
! SysV allows the clock interrupt to take over the machine at a higher
! priority level than (for example) the serial interrupts.

I don't think so. Microport has the serial interrupts at SPL7 (the
highest) and the clock at the lowest (which is probably why the
clock loses time!). In fact, I doubt Microport is losing that
many interrupts on the serial lines until the entire system
gets too loaded which doesn't take that much  with the overhead 
being incurred.

    -Mike Grenier
    mike@cimcor.mn.org
    uunet!rosevax!cimcor!mike