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

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Date: Thu, 13 Jul 2023 10:22:52 +0800
From: Gavin Li <gavinl@...dia.com>
To: Heng Qi <hengqi@...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, 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
Subject: Re: [PATCH net-next V1 0/4] virtio_net: add per queue interrupt
 coalescing support



On 7/12/2023 4:34 PM, Heng Qi wrote:
> 
> 
> 在 2023/7/10 下午5:20, Gavin Li 写道:
>> 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.
> 
> 
> We definitely did the same thing, and I'm waiting for our hardware 
> implementation to be ready to
> push the ethtool + netdim implementation.
> 
> Since this commit log is completely copied from the implementation of 
> the virtio spec, consulting
> each other's scheduling plan in advance can be friendly to avoid us 
> doing the same thing and consuming an extra effort.
> 
> Thanks.
> 
I didn't know about the effort you made and the progress of it.
Since the code has been done and tested, I'll continue submission.
>>
>> 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(-)
>>
>