On Fri, Sep 24, 2021 at 10:35 PM William Kenworthy <bi...@iinet.net.au> wrote:
> In going down the NUMA rabbit hole, I discovered "irqbalance". Does > anyone have an opinion on its usefulness? It is in portage. > > On some multicore arm systems I am using irq affiity to steer certain > irq's to faster CPU's (network, usb) - but from what I have been reading, > irqbalance can improve a mixed workload but a system with a small number of > busy irq's is better served by separating and locking them to different, > more powerful processors. e.g., arm big.LITTLE architectures. > IIRC MSIs have largely addressed the issue, so irqbalance is not so useful anymore. Eg, /proc/interrupts on this system shows that the nvme drive gets 32 interrupts, and the intel gig eth card gets eight interrupts per port, so there's no busy interrupts
