netdev - Re: [PATCH net-next V1 0/4] virtio_net: add per queue interrupt coalescing support

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Date: Mon, 10 Jul 2023 17:25:09 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Gavin Li <gavinl@...dia.com>
Cc: <virtualization@...ts.linux-foundation.org>,
 <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>,
 <bpf@...r.kernel.org>,
 <mst@...hat.com>,
 <jasowang@...hat.com>,
 <xuanzhuo@...ux.alibaba.com>,
 <davem@...emloft.net>,
 <edumazet@...gle.com>,
 <kuba@...nel.org>,
 <pabeni@...hat.com>,
 <ast@...nel.org>,
 <daniel@...earbox.net>,
 <hawk@...nel.org>,
 <john.fastabend@...il.com>,
 <jiri@...dia.com>,
 <dtatulea@...dia.com>,
 "Heng Qi" <hengqi@...ux.alibaba.com>
Subject: Re: [PATCH net-next V1 0/4] virtio_net: add per queue interrupt coalescing support

On Mon, 10 Jul 2023 12:20:01 +0300, Gavin Li <gavinl@...dia.com> wrote:

As far as I know, Heng Qi does that. I'm not sure, it's the same piece.

cc @Heng Qi

Thanks.


> Currently, coalescing parameters are grouped for all transmit and receive
> virtqueues. This patch series add support to set or get the parameters for
> a specified virtqueue.
>
> When the traffic between virtqueues is unbalanced, for example, one virtqueue
> is busy and another virtqueue is idle, then it will be very useful to
> control coalescing parameters at the virtqueue granularity.
>
> Example command:
> $ ethtool -Q eth5 queue_mask 0x1 --coalesce tx-packets 10
> Would set max_packets=10 to VQ 1.
> $ ethtool -Q eth5 queue_mask 0x1 --coalesce rx-packets 10
> Would set max_packets=10 to VQ 0.
> $ ethtool -Q eth5 queue_mask 0x1 --show-coalesce
>  Queue: 0
>  Adaptive RX: off  TX: off
>  stats-block-usecs: 0
>  sample-interval: 0
>  pkt-rate-low: 0
>  pkt-rate-high: 0
>
>  rx-usecs: 222
>  rx-frames: 0
>  rx-usecs-irq: 0
>  rx-frames-irq: 256
>
>  tx-usecs: 222
>  tx-frames: 0
>  tx-usecs-irq: 0
>  tx-frames-irq: 256
>
>  rx-usecs-low: 0
>  rx-frame-low: 0
>  tx-usecs-low: 0
>  tx-frame-low: 0
>
>  rx-usecs-high: 0
>  rx-frame-high: 0
>  tx-usecs-high: 0
>  tx-frame-high: 0
>
> In this patch series:
> Patch-1: Extract interrupt coalescing settings to a structure.
> Patch-2: Extract get/set interrupt coalesce to a function.
> Patch-3: Support per queue interrupt coalesce command.
> Patch-4: Enable per queue interrupt coalesce feature.
>
> Gavin Li (4):
>   virtio_net: extract interrupt coalescing settings to a structure
>   virtio_net: extract get/set interrupt coalesce to a function
>   virtio_net: support per queue interrupt coalesce command
>   virtio_net: enable per queue interrupt coalesce feature
>
>  drivers/net/virtio_net.c        | 169 ++++++++++++++++++++++++++------
>  include/uapi/linux/virtio_net.h |  14 +++
>  2 files changed, 154 insertions(+), 29 deletions(-)
>
> --
> 2.39.1
>