Bug 22099

Summary:	Xircom CreditCard CM-56T Modem keeps giving interrupt-level buffer overflows.
Product:	Base System	Reporter:	kienow <kienow>
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	4.1-STABLE
Hardware:	Any
OS:	Any

Description kienow 2000-10-18 23:50:18 UTC

Whenever I place a heavy network load on my modem I get the following
messages over and over.  Why does this happen? and how can it be fixed?
Also, what are the results of these messages? Am I not getting the
best speed on my connection as I should?

sio3: 88 more interrupt-level buffer overflows (total 88)
sio3: 50 more interrupt-level buffer overflows (total 138)
sio3: 58 more interrupt-level buffer overflows (total 196)
sio3: 8 more interrupt-level buffer overflows (total 204)
sio3: 179 more interrupt-level buffer overflows (total 383)
sio3: 81 more interrupt-level buffer overflows (total 464)
sio3: 35 more interrupt-level buffer overflows (total 499)

Comment 1 Bruce Evans 2000-10-27 07:42:25 UTC

On Wed, 18 Oct 2000 kienow@infinet.com wrote:

> >Description:
> Whenever I place a heavy network load on my modem I get the following
> messages over and over.  Why does this happen? and how can it be fixed?
> Also, what are the results of these messages? Am I not getting the
> best speed on my connection as I should?
> 
> sio3: 88 more interrupt-level buffer overflows (total 88)
> sio3: 50 more interrupt-level buffer overflows (total 138)

This might be caused by the modem not emulating a UART properly.  If it
has a too-large buffer, then it might flood the driver buffers.  Try
enabling RTS/CTS flow control if it isn't already.  Try increasing
cp4ticks in the driver.

Bruce

Comment 2 iedowse freebsd_committer

2001-11-17 20:00:18 UTC

State Changed
From-To: open->feedback


Does this problem still occur?

Comment 3 iedowse freebsd_committer

2002-06-02 11:45:45 UTC

State Changed
From-To: feedback->closed


Feedback timeout.