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

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Date: Tue, 11 Jul 2023 10:34:33 +0800
From: Gavin Li <gavinl@...dia.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.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, 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 7/10/2023 5:25 PM, Xuan Zhuo wrote:
> External email: Use caution opening links or attachments
>
>
> 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.
Do you mean the one below?

https://lists.oasis-open.org/archives/virtio-dev/202303/msg00415.html

The code is to implement what it described and I don't have better 
words. So, I copied the text from Heng Qi's.

>
>
>> 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
>>