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Re: [Qemu-devel] [PATCH 0/4] RFC: A VFIO based block driver for NVMe dev


From: Tian, Kevin
Subject: Re: [Qemu-devel] [PATCH 0/4] RFC: A VFIO based block driver for NVMe device
Date: Thu, 29 Dec 2016 04:09:39 +0000

> From: Fam Zheng
> Sent: Wednesday, December 21, 2016 12:32 AM
> 
> This series adds a new protocol driver that is intended to achieve about 20%
> better performance for latency bound workloads (i.e. synchronous I/O) than
> linux-aio when guest is exclusively accessing a NVMe device, by talking to the
> device directly instead of through kernel file system layers and its NVMe
> driver.
> 

Curious... if the NVMe device is exclusively owned by the guest, why
not directly passing through to the guest? is it a tradeoff between
performance (better than linux-aio) and composability (snapshot and
live migration which not supported by direct passthrough)?

Thanks
Kevin



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