linux-kernel - Re: [RFC PATCH V2 0/8] Packed ring for vhost

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Message-ID: <20180326190130.GE6928@char.us.oracle.com>
Date:   Mon, 26 Mar 2018 15:01:30 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        kvm@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V2 0/8] Packed ring for vhost

On Mon, Mar 26, 2018 at 11:38:45AM +0800, Jason Wang wrote:
> Hi all:
> 
> This RFC implement packed ring layout. The code were tested with pmd
> implement by Jens at
> http://dpdk.org/ml/archives/dev/2018-January/089417.html. Minor change
> was needed for pmd codes to kick virtqueue since it assumes a busy
> polling backend.
> 
> Test were done between localhost and guest. Testpmd (rxonly) in guest
> reports 2.4Mpps. Testpmd (txonly) repots about 2.1Mpps.

And how does it compare to older ring layout?

> 
> Notes: The event suppression /indirect descriptor support is complied
>        test only because of lacked driver support.
> 
> Changes from V1:
> 
> - Refactor vhost used elem code to avoid open coding on used elem
> - Event suppression support (compile test only).
> - Indirect descriptor support (compile test only).
> - Zerocopy support.
> - vIOMMU support.
> - SCSI/VSOCK support (compile test only).
> - Fix several bugs
> 
> For simplicity, I don't implement batching or other optimizations.
> 
> Please review.
> 
> Thanks
> 
> Jason Wang (8):
>   vhost: move get_rx_bufs to vhost.c
>   vhost: hide used ring layout from device
>   vhost: do not use vring_used_elem
>   vhost_net: do not explicitly manipulate vhost_used_elem
>   vhost: vhost_put_user() can accept metadata type
>   virtio: introduce packed ring defines
>   vhost: packed ring support
>   vhost: event suppression for packed ring
> 
>  drivers/vhost/net.c                | 138 ++-----
>  drivers/vhost/scsi.c               |  62 +--
>  drivers/vhost/vhost.c              | 818 ++++++++++++++++++++++++++++++++++---
>  drivers/vhost/vhost.h              |  46 ++-
>  drivers/vhost/vsock.c              |  42 +-
>  include/uapi/linux/virtio_config.h |   9 +
>  include/uapi/linux/virtio_ring.h   |  32 ++
>  7 files changed, 921 insertions(+), 226 deletions(-)
> 
> -- 
> 2.7.4
>