Probing for lost interrupts...

campbell@tirian.che.curtin.edu.au
Mon, 26 May 1997 08:27:18 +0000


I am having trouble trying to track down the source of some lost
interrupts.

Is it possible from user space to develop a monitoring program that
can compare the CMOS clock to the "jiffy" count of the kernel (from
what I understand this is incremented for every timer interrupt) and
print a message every time there is a "slipage".

I have been working on the ZIP driver for linux, I have a beta driver
(fairly heavy rewrite of most routines). This driver should not disable
interrupts for more than a couple of instructions, I have reports
indicating that PPP is loosing a few bytes due to a lost interrupt
(the actual report indicated that the sound card was also in use).

It would be nice to have such a utility as this will make it easier
to locate the problem.

Due to bandwith restrictions I can not be on this mailing list,
please CC me (campbell@tirian.che.curtin.edu.au) on any replies.

David Campbell