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Date:      Wed, 4 Mar 1998 22:10:12 -0500
From:      dmaddox@scsn.net (Donald J. Maddox)
To:        Evan Champion <evanc@synapse.net>, Matthew Thyer <Matthew.Thyer@dsto.defence.gov.au>, Mike Smith <mike@smith.net.au>
Cc:        shimon@simon-shapiro.org, current@FreeBSD.ORG
Subject:   Re: silo overflows (Was Re: 3.0-RELEASE?)
Message-ID:  <19980304221012.62373@scsn.net>
In-Reply-To: <053601bd47dd$6cedf300$c9252fce@cello.synapse.net>; from Evan Champion on Wed, Mar 04, 1998 at 09:21:37PM -0500
References:  <053601bd47dd$6cedf300$c9252fce@cello.synapse.net>

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On Wed, Mar 04, 1998 at 09:21:37PM -0500, Evan Champion wrote:
> >This happens a lot as after several hours (2 or 3) of using
> >ijppp and XFree86 the count of FIFO overflows can be around 100.
> 
> 
> I have a Pentium Pro 200 with 16650's (and the 16650's are detected) and
> during a full install of FreeBSD over 128kbps ISDN (230.4kbps port speed) I
> would get around 700 FIFO overflows.  Someone would have to do a lot of
> convincing to get me to believe the driver is working properly when a
> machine like that can't handle a 128kbps datastream in single user mode...
> 

I had this same problem, and the following fix from John Dyson works
for me:

--------------------------------------------------------------------

Try the modifications noted in the included info.  I
no longer get any kind of sio messages.


-- 
John                  | Never try to teach a pig to sing,
dyson@freebsd.org     | it just makes you look stupid,
jdyson@nc.com         | and it irritates the pig.



Index: sio.c
===================================================================
RCS file: /local/home/ncvs/src/sys/i386/isa/sio.c,v
retrieving revision 1.194
diff -r1.194 sio.c
117a118
> /*
119a121,123
> */
> #define RB_I_HIGH_WATER (TTYHOG / 2)
> #define RS_IBUFSIZE (TTYHOG / 4)


Add this to your system conf:

options		"MSIZE=256"
options		"TTYHOG=4096"


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