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    SubjectRe: [PATCH] PCI: vmd: Do not disable MSI-X remapping in VMD 28C0 controller
    Keith Busch <kbusch@kernel.org> 于2022年12月23日周五 05:56写道:
    >
    > With 12 drives and only 6 CPUs, the bypass mode is going to get more irq
    > context switching. Sounds like the non-bypass mode is aggregating and
    > spreading interrupts across the cores better, but there's probably some
    > cpu:drive count tipping point where performance favors the other way.

    We found that tunning the interrupt aggregation can also bring the
    drive performance back to normal.

    > The fio jobs could also probably set their cpus_allowed differently to
    > get better performance in the bypass mode.

    We used the cpus_allowed in FIO to fix 12 dirves in 6 different CPU.

    By the way, sorry for emailing twice, the last one had the format problem.

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