Hi,
the new kernel 4.14.11 comes with the PTI patches. There are reports which
indicate that these patches can have a severe performance impact (e.g.
https://www.phoronix.com/scan.php?page=article&item=linux-415-x86pti&num=1)
I did some benchmarks with DT. I am using Manjaro with latest kernel
4.14.11-1-MANJARO from testing repos. I am evaluating how long DT is processing
the pixelpipe:
for d in $(seq 1 5); do
echo -n "run $d: "
darktable-cli bench.SRW test-$d.jpg --core --disable-opencl -d perf -d
opencl | grep "processing took"
done
I did up to 15 runs with and without pti enabled (kernel parameter pti=off
turns it off). The differences are neglectable:
with PTI = avg. 14,2581 s
without PTI = avg. 14,1835 s
Difference = 0,5 %
The differnce is neglectable. It looks like DT performance is not affected by
the PTI patches.
Matthias
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