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Date:      Sat, 17 Jun 1995 19:30:04 -0700
From:      Heikki Suonsivu <hsu@clinet.fi>
To:        freebsd-bugs
Subject:   kern/528: interrupt-level buffer overflows
Message-ID:  <199506180230.TAA10117@freefall.cdrom.com>
In-Reply-To: Your message of Sun, 18 Jun 1995 05:27:39 %2B0300 <199506180227.FAA01387@katiska.clinet.fi>

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>Number:         528
>Category:       kern
>Synopsis:       slow 386 reports excessive interrupt-level buffer overlows
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs (FreeBSD bugs mailing list)
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jun 17 19:30:02 1995
>Originator:     Heikki Suonsivu
>Organization:
Helsinki University of Technology, Finland
>Release:        FreeBSD 2.0-BUILT-19950507 i386
>Environment:

	386-16, IDE disk, 10M.
	A ppp router, 38400 leased line.  16550 serial port. wd8013.
	It is dedicated solely for the purpose of routing this one
	single connection.

>Description:

	Kernel spits out lot of these

Jun 18 05:14:47 pommi /kernel: sio1: 119 more interrupt-level buffer over
flows (total 3642)
Jun 18 05:14:47 pommi /kernel: sio1: 119 more interrupt-level buffer overflows (
total 3642)

	It also very easily reboots when lots of PPP load exits. 
	Low tcp performance hints that it is loosing lots of data.

>How-To-Repeat:

	Use FreeBSD as a router for a PPP connection on a slow machine.

>Fix:
	
	I think this feature has already been discussed; grepping
	'interrupt-level' from FAQ's didn't help.  If this is a feature
	which can be worked around, this might be a doc-bug?  However, I
	find it curous how a 386-16 could be too slow to respond for a 38400
	bps link? 



>Audit-Trail:
>Unformatted:





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