Am 25.05.22 um 17:37 schrieb Marcelo Tosatti:
On Wed, May 25, 2022 at 04:07:47PM +0200, Stefan Wahren wrote:
Hi Marcelo,
Am 25.05.22 um 15:56 schrieb Marcelo Tosatti:
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 ?
this was the same as Paul send. I think i need more time for investigation,
maybe there is an issue with the application.
To clarify: they are not the same patches.
Thanks for pointing out. I will test it ASAP.
All i noticed so far is that in good case the CPU usage is around ~ 60 % and
higher, while in bad case the CPU is almost idle. Also the issue is not
reproducible with arm64/defconfig.
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