Messages in this thread | | | From | Xinghui Li <> | Date | Fri, 23 Dec 2022 16:02:03 +0800 | Subject | Re: [PATCH] PCI: vmd: Do not disable MSI-X remapping in VMD 28C0 controller |
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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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