On Mon, Feb 27, 2023 at 06:18:43PM +0800, Qu Wenruo wrote: > I'm not sure if pinning the wq is really the best way to your problem. > > Yes, I understand you want to limit the CPU usage of btrfs workqueues, but > have you tried "thread_pool=" mount option? > > That mount option should limit the max amount of in-flight work items, thus > at least limit the CPU usage. I have tried to use the thread_poll=%u mount option previously. But I didn't observe the effect intensively. I'll try to play with this option more and see if it can yield the desired behavior. > For the wq CPU pinning part, I'm not sure if it's really needed, although > it's known CPU pinning can affect some performance characteristics. What I like about CPU pinning is that we can dedicate CPUs for specific workloads so it won't cause scheduling noise to the app we've dedicated other CPUs for. -- Ammar Faizi
