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

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Message-ID: <CAEm4hYUWf+Fx3FV7vNTc8+O9NSb0iQp75MTC6gra6XapXK=cxw@mail.gmail.com>
Date:   Fri, 23 Dec 2022 16:02:03 +0800
From:   Xinghui Li <korantwork@...il.com>
To:     Keith Busch <kbusch@...nel.org>
Cc:     Jonathan Derrick <jonathan.derrick@...ux.dev>,
        nirmal.patel@...ux.intel.com, lpieralisi@...nel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xinghui Li <korantli@...cent.com>
Subject: Re: [PATCH] PCI: vmd: Do not disable MSI-X remapping in VMD 28C0 controller

Keith Busch <kbusch@...nel.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.