Messages in this thread | | | Date | Sun, 22 May 2022 01:22:00 +0200 | From | Stefan Wahren <> | Subject | vchiq: Performance regression since 5.18-rc1 |
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Hi,
while testing the staging/vc04_services/interface/vchiq_arm driver with my Raspberry Pi 3 B+ (multi_v7_defconfig) i noticed a huge performance regression since [ff042f4a9b050895a42cae893cc01fa2ca81b95c] mm: lru_cache_disable: replace work queue synchronization with synchronize_rcu
Usually i run "vchiq_test -f 1" to see the driver is still working [1].
Before commit:
real 0m1,500s user 0m0,068s sys 0m0,846s
After commit:
real 7m11,449s user 0m2,049s sys 0m0,023s
Best regards
[1] - https://github.com/raspberrypi/userland
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