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SubjectRe: 2.0.30 serial.c, ppp.c and pppd-2.2 questions
   Date: 	Thu, 24 Jul 1997 00:06:25 +0200
From: Andries.Brouwer@cwi.nl

Possibly entirely unrelated (you are talking about missed timer interrupts,
probably I am talking about missed serial line interrupts) but
my SLIP connection is completely unusable when something disk-intensive
is running. FTP gets into an exponential backoff and seems to hang
completely, but recovers some time after the make/find/whatever has
finished.

[This happens both with IDE and SCSI activity. I never really
investigated.]

At least for the IDE case, this is the very well known problem of the
IDE driver disabling interrupts to prevent data corruption in a few
badl;y designed IDE controllers. If you don't have the bad IDE
controllers (see the man page for more details), you will likely be able
to use "hdarm -u 1" which will fix the problem without causing your
disks to get massively corruption.

As far as the SCSI activity, my guess it is a similar problem, but the
solution to solve it is very dependent on the SCSI manufacturer.

- Ted

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