netdev - Re: [PATCH net-next v2] virtio_net: add support for Byte Queue Limits

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Date: Mon, 17 Jun 2024 11:15:42 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jason Xing <kerneljasonxing@...il.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, mst@...hat.com,
	jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
	virtualization@...ts.linux.dev, ast@...nel.org,
	daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
	dave.taht@...il.com, hengqi@...ux.alibaba.com
Subject: Re: [PATCH net-next v2] virtio_net: add support for Byte Queue Limits

Fri, Jun 14, 2024 at 11:54:04AM CEST, kerneljasonxing@...il.com wrote:
>Hello Jiri,
>
>On Thu, Jun 13, 2024 at 1:08 AM Jiri Pirko <jiri@...nulli.us> wrote:
>>
>> From: Jiri Pirko <jiri@...dia.com>
>>
>> Add support for Byte Queue Limits (BQL).
>>
>> Tested on qemu emulated virtio_net device with 1, 2 and 4 queues.
>> Tested with fq_codel and pfifo_fast. Super netperf with 50 threads is
>> running in background. Netperf TCP_RR results:
>>
>> NOBQL FQC 1q:  159.56  159.33  158.50  154.31    agv: 157.925
>> NOBQL FQC 2q:  184.64  184.96  174.73  174.15    agv: 179.62
>> NOBQL FQC 4q:  994.46  441.96  416.50  499.56    agv: 588.12
>> NOBQL PFF 1q:  148.68  148.92  145.95  149.48    agv: 148.2575
>> NOBQL PFF 2q:  171.86  171.20  170.42  169.42    agv: 170.725
>> NOBQL PFF 4q: 1505.23 1137.23 2488.70 3507.99    agv: 2159.7875
>>   BQL FQC 1q: 1332.80 1297.97 1351.41 1147.57    agv: 1282.4375
>>   BQL FQC 2q:  768.30  817.72  864.43  974.40    agv: 856.2125
>>   BQL FQC 4q:  945.66  942.68  878.51  822.82    agv: 897.4175
>>   BQL PFF 1q:  149.69  151.49  149.40  147.47    agv: 149.5125
>>   BQL PFF 2q: 2059.32  798.74 1844.12  381.80    agv: 1270.995
>>   BQL PFF 4q: 1871.98 4420.02 4916.59 13268.16   agv: 6119.1875
>
>I cannot get such a huge improvement when I was doing multiple tests
>between two VMs. I'm pretty sure the BQL feature is working, but the
>numbers look the same with/without BQL.
>
>VM 1 (client):
>16 cpus, x86_64, 4 queues, the latest net-next kernel with/without
>this patch, pfifo_fast, napi_tx=true, napi_weight=128
>
>VM 2 (server):
>16 cpus, aarch64, 4 queues, the latest net-next kernel without this
>patch, pfifo_fast
>
>What the 'ping' command shows to me between two VMs is : rtt
>min/avg/max/mdev = 0.233/0.257/0.300/0.024 ms
>
>I started 50 netperfs to communicate the other side with the following command:
>#!/bin/bash
>
>for i in $(seq 5000 5050);
>do
>netperf -p $i -H [ip addr] -l 60 -t TCP_RR -- -r 64,64 > /dev/null 2>&1 &
>done
>
>The results are around 30423.62 txkB/s. If I remove '-r 64 64', they
>are still the same/similar.

You have to stress the line by parallel TCP_STREAM instances (50 in my
case). For consistent results, use -p portnum,locport to specify the
local port.

Then run TCP_RR, also use -p portnum,locport to specify the local port.

Also, double check the CONFIG_BQL=y is set.


>
>Am I missing something?
>
>Thanks,
>Jason