* utilizing multi queues of a net device
@ 2022-05-02 4:29 Eli Cohen
2022-05-02 16:21 ` Jakub Kicinski
0 siblings, 1 reply; 3+ messages in thread
From: Eli Cohen @ 2022-05-02 4:29 UTC (permalink / raw)
To: virtualization, netdev@vger•kernel.org
Hi all,
I am experimenting with virtio net device running on a host. The net device has
multiple queues and I am trying to measure the throughput while utilizing all
the queues simultaneously. I am running iperf3 like this:
taskset 0x1 iperf3 -c 7.7.7.24 -p 20000 & \
taskset 0x2 iperf3 -c 7.7.7.24 -p 20001 & \
...
taskset 0x80 iperf3 -c 7.7.7.24 -p 20007
Server instances with matching ports exist.
I was expecting traffic to be distributed over the available send queues but
the vast majority goes to a single queue. I do see a few packets going to other
queues.
Here's what tc qdisc shows:
tc qdisc show dev eth1
qdisc mq 0: root
qdisc fq_codel 0: parent :8 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 0: parent :7 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 0: parent :6 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 0: parent :5 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 0: parent :4 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 0: parent :3 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 0: parent :2 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 0: parent :1 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
Any idea?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: utilizing multi queues of a net device
2022-05-02 4:29 utilizing multi queues of a net device Eli Cohen
@ 2022-05-02 16:21 ` Jakub Kicinski
2022-05-03 10:11 ` Eli Cohen
0 siblings, 1 reply; 3+ messages in thread
From: Jakub Kicinski @ 2022-05-02 16:21 UTC (permalink / raw)
To: Eli Cohen; +Cc: virtualization, netdev@vger•kernel.org
On Mon, 2 May 2022 04:29:09 +0000 Eli Cohen wrote:
> Hi all,
>
> I am experimenting with virtio net device running on a host. The net device has
> multiple queues and I am trying to measure the throughput while utilizing all
> the queues simultaneously. I am running iperf3 like this:
>
> taskset 0x1 iperf3 -c 7.7.7.24 -p 20000 & \
> taskset 0x2 iperf3 -c 7.7.7.24 -p 20001 & \
> ...
> taskset 0x80 iperf3 -c 7.7.7.24 -p 20007
>
> Server instances with matching ports exist.
>
> I was expecting traffic to be distributed over the available send queues but
> the vast majority goes to a single queue. I do see a few packets going to other
> queues.
>
> Here's what tc qdisc shows:
>
> tc qdisc show dev eth1
> qdisc mq 0: root
> qdisc fq_codel 0: parent :8 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :7 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :6 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :5 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :4 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :3 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :2 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :1 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
>
> Any idea?
Make sure XPS is configured correctly. Looks like virtio_net cooked
a less-than-prevalent-for-networking way of distributing CPUs.
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: utilizing multi queues of a net device
2022-05-02 16:21 ` Jakub Kicinski
@ 2022-05-03 10:11 ` Eli Cohen
0 siblings, 0 replies; 3+ messages in thread
From: Eli Cohen @ 2022-05-03 10:11 UTC (permalink / raw)
To: Jakub Kicinski; +Cc: virtualization, netdev@vger•kernel.org
> -----Original Message-----
> From: Jakub Kicinski <kuba@kernel•org>
> Sent: Monday, May 2, 2022 7:22 PM
> To: Eli Cohen <elic@nvidia•com>
> Cc: virtualization <virtualization@lists•linux-foundation.org>; netdev@vger•kernel.org
> Subject: Re: utilizing multi queues of a net device
>
> On Mon, 2 May 2022 04:29:09 +0000 Eli Cohen wrote:
> > Hi all,
> >
> > I am experimenting with virtio net device running on a host. The net device has
> > multiple queues and I am trying to measure the throughput while utilizing all
> > the queues simultaneously. I am running iperf3 like this:
> >
> > taskset 0x1 iperf3 -c 7.7.7.24 -p 20000 & \
> > taskset 0x2 iperf3 -c 7.7.7.24 -p 20001 & \
> > ...
> > taskset 0x80 iperf3 -c 7.7.7.24 -p 20007
> >
> > Server instances with matching ports exist.
> >
> > I was expecting traffic to be distributed over the available send queues but
> > the vast majority goes to a single queue. I do see a few packets going to other
> > queues.
> >
> > Here's what tc qdisc shows:
> >
> > tc qdisc show dev eth1
> > qdisc mq 0: root
> > qdisc fq_codel 0: parent :8 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> > qdisc fq_codel 0: parent :7 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> > qdisc fq_codel 0: parent :6 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> > qdisc fq_codel 0: parent :5 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> > qdisc fq_codel 0: parent :4 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> > qdisc fq_codel 0: parent :3 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> > qdisc fq_codel 0: parent :2 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> > qdisc fq_codel 0: parent :1 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> >
> > Any idea?
>
> Make sure XPS is configured correctly. Looks like virtio_net cooked
> a less-than-prevalent-for-networking way of distributing CPUs.
That make the trick.
Thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
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