From: keith.busch@intel.com (Keith Busch)
Subject: Create IO queue variation between kernels
Date: Tue, 27 Sep 2016 18:47:04 -0400 [thread overview]
Message-ID: <20160927224704.GE24200@localhost.localdomain> (raw)
In-Reply-To: <CAG3=cOmN5jGK6kqv_kCiyZL8ypy_uTaA3poooP6cdBLE8AQbJg@mail.gmail.com>
On Tue, Sep 27, 2016@11:39:53AM -0700, Nisha Miller wrote:
> Hi,
>
> We plugged our NVMe controller into a server running Kernel 3.19.8 and
> we were able to create multiple IO queues.
>
> On the same server, if we boot Kernel 2.6.32 we can create only 1 IO
> queue. On 2.6.32, pci_enable_msi_block() always returns number of MSIs
> supported as 1. Since there is no change in the hardware, I'm
> wondering where the problem lies and how we can fix this.
>
> Any clues, ideas, tips greatly appreciated!
In a 2.6.32 kernel on x86, then enabling code should be going through
arch_setup_msi_irqs, which says it doesn't support multiple MSI's "yet".
You can only do 1 MSI on such an old kernel.
prev parent reply other threads:[~2016-09-27 22:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-27 18:39 Create IO queue variation between kernels Nisha Miller
2016-09-27 22:47 ` Keith Busch [this message]
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