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Re: [Qemu-devel] [PATCH v4 3/9] block: Add VFIO based NVMe driver

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v4 3/9] block: Add VFIO based NVMe driver
Date: Wed, 10 Jan 2018 08:43:35 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0

On 01/10/2018 03:18 AM, Fam Zheng wrote:
> This is a new protocol driver that exclusively opens a host NVMe
> controller through VFIO. It achieves better latency than linux-aio by
> completely bypassing host kernel vfs/block layer.
>     $rw-$bs-$iodepth  linux-aio     nvme://
>     ----------------------------------------
>     randread-4k-1     10.5k         21.6k
>     randread-512k-1   745           1591
>     randwrite-4k-1    30.7k         37.0k
>     randwrite-512k-1  1945          1980
>     (unit: IOPS)
> The driver also integrates with the polling mechanism of iothread.
> This patch is co-authored by Paolo and me.

Then shouldn't you include Paolo's S-o-b?

> Signed-off-by: Fam Zheng <address@hidden>
> ---

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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