linux-kernel - Re: [PATCH] vfio/pci: Virtualize Maximum Payload Size

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Date:   Wed, 20 Sep 2017 12:29:26 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Auger Eric <eric.auger@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, jcm@...hat.com,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] vfio/pci: Virtualize Maximum Payload Size

On 9/20/2017 12:11 PM, Alex Williamson wrote:
> My impression is that the issue would be inefficiency.  There should be
> nothing functionally wrong with a read request less than MPS, but we're
> not "filling" the TLP as much as the topology allows.  Is that your
> understanding as well, Sinan?

That's my understanding as well. It would be a performance hit to use a
value less than MPS.


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.