I remember buying WDT cards for XT PCs. Plugged into the ISA bus. Could do an NMI or it could also close the reset button circuit. My code was so bad that they saved the day on many occasions.
From: Ken Hohhof Sent: Thursday, January 21, 2016 4:06 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450 Watchdog resets - was: To Cambium WithLove- Replace the bad ePMP units. Maybe some of the folks here who still do firmware design can comment, my experience is 15-20 years old. But I remember a watchdog reset being implemented either as a hardware timer that the firmware or OS had to hit before it timed out (we used to call it punching the dog) or a chip based timer that generated a non maskable interrupt, either way the idea being if the firmware went off to la la land like got caught in a loop or some process started hogging all the resources, the device would restart rather than locking up. With a realtime OS or scheduler, if the watchdog process doesn’t run on schedule, it probably means something is wrong in firmware. So I wouldn’t necessarily doubt what they told you. What I used to worry about was the firmware would go stark raving mad, but still be sane enough to punch the dog. Oh, and remember the countdown clock on Lost where you had to enter 4 8 15 16 23 42? That was kind of a watchdog timer. From: Brian Sullivan Sent: Thursday, January 21, 2016 4:10 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450 Watchdog resets - was: To Cambium With Love- Replace the bad ePMP units. I was assured today that the issue isn't the hardware.� Evidently this issue can be solved with an upcoming software upgrade. Time will tell. http://community.cambiumnetworks.com/t5/PMP-450/13-2-to-13-4-System-Reset-Exception-Watchdog-Reset/td-p/43347/page/2 On 1/21/2016 4:02 PM, Joe Falaschi wrote: We have some APs that have uptime over 60 days but many reboot every 1-3 weeks. �This is definitely an outlier. �We've been in contact with Cambium on this via an open ticket and sending them all of the information they request and nobody has said oh gosh that is bad hardware RMA it. �So, we're just going around and around. �We'll end up just replacing it and hoping they will take it back because obviously this is bad. �We are running 14.x per their request. �We saw this on 13.x as well. Joe On Jan 21, 2016, at 12:05 PM, Ken Hohhof wrote: Joe, that is seriously bad.� I see watchdog resets and a few stack dumps, but uptime on 450 APs is typically 2-4 weeks, despite the recent cold weather, in fact I don�t think it has been more common than it was last summer.� I have not gone to 14.x though, everything is still on 13.2. � So either you have a bad unit, or 14.x is making it much worse.� If everyone was seeing resets every few minutes or hours, I think there would be villagers with torches and pitchforks outside Cambium HQ. � Brian from FVI does have a thread on the Cambium Community about this. � FWIW, I have one 450i 900 MHz which necessarily is on 14.1, and it does not appear to be having watchdog resets.� Lightly loaded however, just 2 subs. � � From: Joe Falaschi Sent: Thursday, January 21, 2016 11:34 AM To: [email protected] Subject: Re: [AFMUG] Cambium 450 Watchdog resets - was: To Cambium With Love- Replace the bad ePMP units. � We see a ton of reboots on the 450 platform as well.� It's getting pretty frustrating simply because this is such a long term issue.� One of my APs has rebooted 195 times (now running 14.1.2).� They are saying we should replace the AP but it is unclear if we can RMA it or not.� We do have an open ticket. � Joe Falaschi e-vergent � � � <Screen Shot 2016-01-21 at 11.30.16 AM.png> On Jan 20, 2016, at 9:26 PM, Mark Radabaugh wrote: Hum�� sounds very similar.�� It�s temperature sensitive as well - gets far worse with low temperatures, and we are having pretty cold temps this week.�� � Extremely frustrating and causing real customer complaints. � Mark � On Jan 20, 2016, at 9:28 PM, Tushar Patel <[email protected]> wrote: � Over two years we have been seeing random reboot. We were told over and over again you are the only one.� Then few people started reporting. � But cambium never could get bottom of the problems for two years so, I gave up on cambium fixing this random reboot.� We stop calling them about it. � As the new versions of the software has come out over two years we have see the frequency of the problem reduce but not gone away. Tushar � On Jan 20, 2016, at 6:25 PM, Mark Radabaugh <[email protected]> wrote: Tushar, � What did you give up on?�� Or do? � Please note the mailing and shipping address change below: � Mark Radabaugh Amplex 22690 Pemberville Rd Luckey, OH 43443 419-837-5015 x1021 [email protected] � On Jan 20, 2016, at 4:49 PM, Tushar Patel <[email protected]> wrote: � That's what they used to tell us too.� We have given up on the subject now. Tushar � On Jan 20, 2016, at 1:09 PM, Mark Radabaugh <[email protected]> wrote: Wait - they keep telling us we are the only ones that this happens to with 450? � So who else is having reboot-o-rama with 450�s? � Mark � On Jan 20, 2016, at 1:20 PM, Brian Sullivan <[email protected]> wrote: � I wish they would fix/replace the bad 450 AP's that suffer from Watchdog Resets.� Although replacing 100 450 AP's is cheaper than ePMP.� :-/ On 1/20/2016 12:11 PM, Josh Luthman wrote: Why would making the memory faster degrade performance? � � Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 � On Wed, Jan 20, 2016 at 1:00 PM, Tyson Burris @ Internet Communications Inc <[email protected]> wrote: Hello Cambium, � At the MidWest-IX launch party last night, several of us Indiana WISPs compared notes on the �cold weather� problems we are seeing with ePMPs.� It was very interesting to learn we are experience identical problems across the spectrum. We all understand this is a DRAM issue with certain units you have identified.� We also understand the firmware RC that has been made available to fix this short term. The bottom line is we are very frustrated and grow tired of dealing with it.� � Our concern is simple.� If your software fix �degrades� the performance of the product or triggers other issues, as it has been suggested, we would prefer a full recall and replacement program immediately. � If the suggestion that the fix will degrade the product performance is inaccurate and not cause other issues, I would like for this to be made public.� � Thank you, � Tyson Burris, President Internet Communications Inc. 739 Commerce Dr. Franklin, IN 46131 � 317-738-0320 Daytime # 317-412-1540 Cell/Direct # Online: www.surfici.net � <Mail Attachment.png> What can ICI do for you? Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones - IP Security - Fiber - Tower - Infrastructure. � CONFIDENTIALITY NOTICE: This e-mail is intended for the addressee shown. It contains information that is confidential and protected from disclosure. Any review, dissemination or use of this transmission or its contents by unauthorized organizations or individuals is strictly prohibited. � � � � � � � �
