linux-kernel - Re: [PATCH v2 06/10] nvme/core: add mdev interfaces

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Date:   Mon, 06 May 2019 11:34:26 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Christoph Hellwig <hch@....de>, Max Gurtovoy <maxg@...lanox.com>
Cc:     Fam Zheng <fam@...hon.net>, kvm@...r.kernel.org,
        Wolfram Sang <wsa@...-dreams.de>,
        linux-nvme@...ts.infradead.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Keith Busch <keith.busch@...el.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Christoph Hellwig <hch@...radead.org>,
        Liang Cunming <cunming.liang@...el.com>,
        Jens Axboe <axboe@...com>,
        Alex Williamson <alex.williamson@...hat.com>,
        John Ferlan <jferlan@...hat.com>,
        Liu Changpeng <changpeng.liu@...el.com>,
        Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Amnon Ilan <ailan@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 06/10] nvme/core: add mdev interfaces

On Mon, 2019-05-06 at 11:31 +0300, Maxim Levitsky wrote:
> On Sat, 2019-05-04 at 08:49 +0200, Christoph Hellwig wrote:
> > On Fri, May 03, 2019 at 10:00:54PM +0300, Max Gurtovoy wrote:
> > > Don't see a big difference of taking NVMe queue and namespace/partition
> > > to 
> > > guest OS or to P2P since IO is issued by external entity and pooled
> > > outside 
> > > the pci driver.
> > 
> > We are not going to the queue aside either way..  That is where the
> > last patch in this series is already working to, and which would be
> > the sensible vhost model to start with.
> 
> Why are you saying that? I actualy prefer to use a sepearate queue per
> software
> nvme controller, tat because of lower overhead (about half than going through
> the block layer) and it better at QoS as the separate queue (or even few
> queues
> if needed) will give the guest a mostly guaranteed slice of the bandwidth of
> the
> device.

Sorry for typos - I need more coffee :-)

Best regards,
	Maxim Levitsky