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

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Date:   Wed, 30 Aug 2023 15:42:12 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc:     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,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        Gavin Li <gavinl@...dia.com>
Subject: Re: [PATCH net-next V1 0/4] virtio_net: add per queue interrupt
 coalescing support

On Fri, Jul 14, 2023 at 10:10:51AM +0800, Xuan Zhuo wrote:
> On Thu, 13 Jul 2023 07:40:12 -0400, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> > On Mon, Jul 10, 2023 at 12:20:01PM +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.
> >
> > series:
> >
> > Acked-by: Michael S. Tsirkin <mst@...hat.com>
> 
> 
> Why?
> 
> This series has the bug I reported.
> 
> Are you thinking that is ok? Or this is not a bug?
> 
> Thanks.
> 
> 


I missed that mail. What's the bug?

> >
> >
> >
> > > 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
> >