Re: [PATCH] PCI: vmd: Do not disable MSI-X remapping in VMD 28C0 controller

[Xinghui Li]

Keith Busch <kbusch@xxxxxxxxxx> 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.