Date: Wed, 8 May 1996 19:27:34 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: cslye@info.infosite.com (Cameron Slye) Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: serial errors Message-ID: <199605080957.TAA28588@genesis.atrad.adelaide.edu.au> In-Reply-To: <199605080602.XAA25101@info.infosite.com> from "Cameron Slye" at May 7, 96 11:02:12 pm
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Cameron Slye stands accused of saying:
>
> Seem to be getting these errors with some software we are tring to use...
> It is using the port at 115200, and I have set the speed of the device to
> 115200 and still seems to happen... This is on a p133 with 32mb, doing
> nothing else. So I don't think IO is a problem. Any ideas ?
> And I have pages of these errors... TIA.
>
>
> May 7 15:41:59 nfs1 /kernel: sio0: 168 more tty-level buffer overflows (total 43853)
> May 7 15:45:21 nfs1 /kernel: sio0: 3051 more tty-level buffer overflows (total 46904)
> May 7 15:45:37 nfs1 /kernel: sio0: 184 more tty-level buffer overflows (total 47088)
> May 7 15:45:47 nfs1 /kernel: sio0: 72 more tty-level buffer overflows (total 47160)
Your application is spending too long doing something else, and not reading
from the device often enough.
> /* detach from terminal if not debugging */
> if ((!debug) && (!monitor))
> {
> if (fork())
> exit(0);
> for (i = 10; i >= 0; i--)
> (void) close(i);
> (void) open("/dev/null", O_RDONLY);
> (void) dup2(0, 1);
> (void) dup2(0, 2);
> i = open("/dev/tty", O_RDWR);
> if (i > 0)
> {
> (void) ioctl(i, TIOCNOTTY, (char *)NULL);
> (void) close(i);
> }
> }
daemon() does most of this for you.
> for (;;)
> {
> new_log_file(); /* if needed */
> if (rx_data())
> process_data();
> }
process_data() is taking too long, and the device talking to you is
not honouring the flow control that the sio driver will desperately
be asserting.
--
]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[
]] Genesis Software genesis@atrad.adelaide.edu.au [[
]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[
]] realtime instrument control (ph/fax) +61-8-267-3039 [[
]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
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