Hi Juerg,

This is of course a possibility but I tested it at the setup time and
right now:

sudo hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads: 442 MB in  3.00 seconds = 147.14 MB/sec

sudo hdparm -t --direct /dev/sda
/dev/sda:
 Timing O_DIRECT disk reads: 450 MB in  3.01 seconds = 149.73 MB/sec

This is consistent over 10 tests, lowest value was 141 MB/sec (all other 
services running). The fact this happened after an update twice in a year, 
corrected after some weeks the first time, is a clue.
I see some similarities in this topic 
https://github.com/raspberrypi/linux/issues/4133 but as it's not a major topic 
the root cause should be specific to some setup or conditions (a guess)

** Bug watch added: github.com/raspberrypi/linux/issues #4133
   https://github.com/raspberrypi/linux/issues/4133

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https://bugs.launchpad.net/bugs/1962180

Title:
  Samba performance degraded after last update

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