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SubjectRe: 2.0.30 serial.c, ppp.c and pppd-2.2 questions
Theodore Y. Ts'o:

: Date: Wed, 23 Jul 1997 08:07:23 +0200 (MET DST)
: From: R.E.Wolff@BitWizard.nl (Rogier Wolff)

: Yes, I agree. At 38k4 you need 130 ms to fill the flip buffer. And if
: you see this kind of delays there is something "wrong". An easy
: solution like increasing the buffer size may delay the fenomenon to
: the point that it is hard to reproduce, but we haven't really fixed
: anything. In some cases not receiving any chars for 130 ms can be
: annoying too....

: And at 115kbaud you need 44ms to fill the flip buffer. So you'd have to
: miss 4 clock ticks before the flip buffer would be overflowing. I can
: believe we're missing 1, or maybe even 2, but 4?

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.]

Andries

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