I can confirm the same problem for me (however the system in question is
actually Fedora 27, but no other online source provided a solution
except for this bug report):

kernel: 4.10.10  SMP PREEMPT  i686 (32bit)
compiled with gcc_7.3.1

started with write speeds at around 180 MB/s and within minutes would
slow down and stabilize at 3 MB/s


# echo 3 > /proc/sys/vm/drop_caches

did not work, but

# sysctl -w vm.highmem_is_dirtyable=1

worked like a charm!

I will try to see if I can test some of the other kernels as mentioned
above (64bit, versions above 4.13) and see if those manifest the same
issues.

Thanks Norbert (nrbrtx)!

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https://bugs.launchpad.net/bugs/1333294

Title:
  32-bit kernel HDD slow write speed

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