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Re: why do errors stop during backup

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>> i have an old pci analog video capture card that uses bttv
>> it fills the log with timeout errors, 1 or 2 per minute
>> bttv: 2: timeout: drop=725178 irq=4905870/4927747, risc=2014e424, bits: HSYNC
>> each night i run a backup with rsync
>> during that backup time there are no bttv errors
>> the cameras continue to capture normally
>> i realize the details of this are probably way over my head
>> can anyone explain this in simple terms
>
> i ran stress -c 2 for an hour
> during this time there were no bttv timeouts
> the cameras worked fine

Both observations suggest that the timeouts occur when the system is
*not* under load.  It is counter-intuitive, but it can happen for
example if some elements are "put to sleep" in response to low use,
which in turns increases the latency to use them next time (because they
first have to wake up).

Note that I have no idea what's actually going on in your specific case.


        Stefan

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re: why do errors stop during backup fxkl47BF@protonmail.com - 2024-12-02 23:30 +0100
  Re: why do errors stop during backup Stefan Monnier <monnier@iro.umontreal.ca> - 2024-12-03 18:10 +0100

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