linux-kernel - Re: [PATCH net-next V3 0/4] virtio_net: add per queue interrupt coalescing support

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Message-ID: <20230724051820.GA53686@h68b04307.sqa.eu95>
Date:   Mon, 24 Jul 2023 13:18:20 +0800
From:   Heng Qi <hengqi@...ux.alibaba.com>
To:     Gavin Li <gavinl@...dia.com>
Cc:     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, gavi@...dia.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH net-next V3 0/4] virtio_net: add per queue interrupt
 coalescing support

On Mon, Jul 24, 2023 at 06:40:44AM +0300, Gavin Li wrote:
> 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.
> 

For series:

Reviewed-by: Heng Qi <hengqi@...ux.alibaba.com>

After this set is merged, I will issue the netdim patchset on top of this.

Thanks.

> 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
> 
> 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
> ---
> changelog:
> v1->v2
> - Addressed the comment from Xuan Zhuo
> - Allocate memory from heap instead of using stack memory for control vq
> 	messages
> v2->v3
> - Addressed the comment from Heng Qi
> - Use control_buf for control vq messages
> ---
>   virtio_net: enable per queue interrupt coalesce feature
> 
>  drivers/net/virtio_net.c        | 172 ++++++++++++++++++++++++++------
>  include/uapi/linux/virtio_net.h |  14 +++
>  2 files changed, 157 insertions(+), 29 deletions(-)
> 
> -- 
> 2.39.1
>