Subj : File Size Issue
To   : Ky Moffet
From : Barry Martin
Date : Sun Oct 18 2020 11:31:00


Hi Ky!

 KM> BARRY MARTIN wrote:
 > Hi Folks!
 >
 > Putting the question here only because it involves *NIX systems.
 >
 > Issue is a file greater than 1 GB does not seem to transfer.  Seems to
 > be the or close to the 'magic number' cut off point: a 943.7 MB file
 > transferred but a 1.4 GB did not.
 >
 > Source files are on a USB thumbdrive on a Raspberry Pi 4 running
 > MotionEye OS -- surveillance utility with its own operating system.  The
 > files are (usually) immediately transmitted across the WiFi to the NAS.
 > The NAS doesn't appear to have a problem with multi-GB files
 > originating completely by wire (all Ethernet connection).
 >
 > I don't think there is a size limit with transferring via WiFi but is
 > there a time-out limit?  The transfer speed from the MotionEye RPi unit
 > to my system (the computer I'm on currently) is rather slow, whereas
 > transfering the same file after it has been transferred to the NAS is
 > very quick.

 KM> If there's a limit, I'd guess it's MotionEye that's failing, not
 KM> *NIX anything.

That's what I was thinking.


 KM> Timeout should not come into play unless no data is transferred
 KM> for however long, not just because the file is big and takes a
 KM> Long Time.
 
Based on other experiences agree.  As long as the connection is active 
and something else isn't imposing a limitation then the connection 
should be maintained.  Didn't think there was a 'rule' but figured I'd 
ask anyway -- gotta learn!


 KM> I'd be suspicious that maybe MotionEye caches the whole file in
 KM> swap (or worse, in RAM) before sending it off, and when it runs
 KM> out of cache space, that's when it fails.
 
Possible; no idea and may not be able to find out as can't get to that 
part, or at least I haven't figured out how.  (The older Raspberry Pi 
utility for duplicating [micro]SD cards wouldn't copy the partition 
MotionEye used for OS.)

And yesteday I had to reboot my WiFi access point: the connected devices
were and weren't working.  Could ping some but they stopped getting 
data.  Not sure if that had something to do with the file size problem 
as go GB files to transfer since I posted.  And based on previous 
versions I can't upload/insert a file to test.


 
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