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

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Message-ID: <d6f4c641-c9c1-255a-18e5-e7956bbcac6a@redhat.com>
Date:   Thu, 21 Sep 2017 08:36:30 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Sinan Kaya <okaya@...eaurora.org>,
        Alex Williamson <alex.williamson@...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

Hi Sinan,

On 20/09/2017 18:29, Sinan Kaya wrote:
> 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.
> 
> 

Thank you for your explanations.

best Regards

Eric