Messages in this thread | | | Date | Wed, 25 May 2022 16:07:47 +0200 | Subject | Re: vchiq: Performance regression since 5.18-rc1 | From | Stefan Wahren <> |
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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@fuller.cnet/ >> >> 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.
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.
> > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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