Hi Barry,
On Fri, 21 Nov 2025 at 06:54, Barry Song 21cnbao@gmail.com wrote:
Hi Sumit,
Using the micro-benchmark below, we see that mmap becomes 3.5X faster:
Marcin pointed out to me off-tree that it is actually 35x faster, not 3.5x faster. Sorry for my poor math. I assume you can fix this when merging it?
Sure, I corrected this, and is merged to drm-misc-next
Thanks, Sumit.
W/ patch:
~ # ./a.out mmap 512MB took 200266.000 us, verify OK ~ # ./a.out mmap 512MB took 198151.000 us, verify OK ~ # ./a.out mmap 512MB took 197069.000 us, verify OK ~ # ./a.out mmap 512MB took 196781.000 us, verify OK ~ # ./a.out mmap 512MB took 198102.000 us, verify OK ~ # ./a.out mmap 512MB took 195552.000 us, verify OK
W/o patch:
~ # ./a.out mmap 512MB took 6987470.000 us, verify OK ~ # ./a.out mmap 512MB took 6970739.000 us, verify OK ~ # ./a.out mmap 512MB took 6984383.000 us, verify OK ~ # ./a.out mmap 512MB took 6971311.000 us, verify OK ~ # ./a.out mmap 512MB took 6991680.000 us, verify OK
Thanks Barry