[ntp:hackers] FreeBSD serial ports

Greg Dowd GDowd at symmetricom.com
Thu Feb 10 09:27:37 PST 2005


Dave,
	That may be fixed by changing the 0 length read to drop the
recvbuf and continue.  That fix didn't work for ACTS since the daemon
would hard loop there forever since 0 length read meant eof without &C
change.  If the problem is a momentary glitch in hardware, perhaps it
would recover?

The daemon really shouldn't be allocating a recvbuf on a 0 length read
anyway, should it?  There's no state that I know of where you would need
to timestamp the hangup in refclock.


-----Original Message-----
From: hackers-bounces at support.ntp.org
[mailto:hackers-bounces at support.ntp.org] On Behalf Of David L. Mills
Sent: Thursday, February 10, 2005 8:52 AM
To: hackers at ntp.org
Subject: [ntp:hackers] FreeBSD serial ports

Folks,

I find that some, but not all, FreeBSD machines hang in a loop when
first coming up with a reference clock connected. If linked via cuaa1,
for instance, when coming up with the clock connected, the "too many
recbufs" line shows up several times and then hangs. With the clock not
connected, it comes up normally. If the clock is connected after the
daemon is started, it works correctly.

I suspect this problem is related to the problem with ACTS mentioned
previously.

Dave

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Greg Dowd



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