[mythtv-users] a new type of error

Jim Abernathy jfabernathy at gmail.com
Mon Mar 12 12:15:15 UTC 2018

On 03/09/2018 03:53 PM, Jim Abernathy wrote:
> On 03/09/2018 01:38 PM, f-myth-users at media.mit.edu wrote:
>> I had two identical chassis which would display that sort of error only
>> under heavy simultaneous disk and network load.  I discovered this while
>> first installing them and doing lots of heavy disk copying to test their
>> operation.  Heavy disk activity alone, or heavy network activity alone,
>> was fine.  I put an Intel ethernet NIC in a PCIe slot and stopped using
>> the onboard network and the problem vanished.  My conclusion was that
>> the Realtek ethernet hardware and/or drivers were garbage.  This was
>> under Ubuntu 12.04, but I haven't tried verifying under newer OS's;
>> I just generally steer clear of onboard mobo ethernet if it's Realtek.
>> Did your machine take any sort of update recently that might have
>> changed its device drivers?  Alternately, you may have failing caps
>> on the motherboard somewhere that are leading to erratic operation,
>> possibly combined with high current draw---not necessarily overall
>> draw, but only in one subsystem of the board.  How old is this hardware?
>> Does a visual inspection show any bulging/leaking caps?  (This is not
>> sufficient---they may be bad but visually fine---but if they're bad
>> visually, you probably have an issue.)
>> Others have suggested PSU issues; if it's easy to replace, try it.
>> Otherwise, and if no software at all has changed, you might try testing
>> whether it's one of these "this plus that" load issues, as above, which
>> may ultimately require you to recap/replace your motherboard. Again,
>> only if no software has changed in the interim---but you say you've
>> done some updating, so check stuff relevant to the OS and its drivers.
>> I don't suppose you can roll back in any way?
> I changed out the 450 watt supply for a 650 watt and I changed the 
> motherboard to a newer one with a Core i7-3770K.
> We'll see if I get any NMI errors in the next few days.
> Jim A

It's been several days now and everything is back to working normally.  
I don't know if it was the motherboard or the PSU, but it's fixed now.  
That was my last good backup motherboard and PSU, so next time a failure 
will cost me more than just my time.

Thanks for all the advice and counsel.

Jim A

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