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 11:10:49 +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,
 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 Tue, 11 Jul 2023 10:34:33 +0800, Gavin Li <gavinl@...dia.com> wrote:
>
> 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?

YES


>
> 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.

Maybe he wrote code for it. I think you should ask him about his plans first.

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
> >>