On Mon, May 23, 2022 at 09:09:07AM +0200, Sebastian Andrzej Siewior wrote: > On 2022-05-22 01:22:00 [+0200], Stefan Wahren wrote: > > Hi, > 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]. > > What about > https://lore.kernel.org/all/YmrWK%2FKoU1zrAxPI@xxxxxxxxxxx/ > > Sebastian Stefan, Can you please try the patch above ?
