netdev - Re: [RFC/RFT v2 0/3] Introduce GRO support to cpumap codebase

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Message-ID: <01dcfecc-ab8e-43b8-b20c-96cc476a826d@intel.com>
Date: Tue, 12 Nov 2024 18:43:22 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Daniel Xu <dxu@...uu.xyz>
CC: Lorenzo Bianconi <lorenzo@...nel.org>, <bpf@...r.kernel.org>,
	<kuba@...nel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
	<andrii@...nel.org>, <john.fastabend@...il.com>, <hawk@...nel.org>,
	<martin.lau@...ux.dev>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<pabeni@...hat.com>, <netdev@...r.kernel.org>, <lorenzo.bianconi@...hat.com>
Subject: Re: [RFC/RFT v2 0/3] Introduce GRO support to cpumap codebase

From: Alexander Lobakin <aleksander.lobakin@...el.com>
Date: Tue, 22 Oct 2024 17:51:43 +0200

> From: Alexander Lobakin <aleksander.lobakin@...el.com>
> Date: Wed, 9 Oct 2024 14:50:42 +0200
> 
>> From: Lorenzo Bianconi <lorenzo@...nel.org>
>> Date: Wed, 9 Oct 2024 14:47:58 +0200
>>
>>>> From: Lorenzo Bianconi <lorenzo@...nel.org>
>>>> Date: Wed, 9 Oct 2024 12:46:00 +0200
>>>>
>>>>>> Hi Lorenzo,
>>>>>>
>>>>>> On Mon, Sep 16, 2024 at 12:13:42PM GMT, Lorenzo Bianconi wrote:
>>>>>>> Add GRO support to cpumap codebase moving the cpu_map_entry kthread to a
>>>>>>> NAPI-kthread pinned on the selected cpu.
>>>>>>>
>>>>>>> Changes in rfc v2:
>>>>>>> - get rid of dummy netdev dependency
>>>>>>>
>>>>>>> Lorenzo Bianconi (3):
>>>>>>>   net: Add napi_init_for_gro routine
>>>>>>>   net: add napi_threaded_poll to netdevice.h
>>>>>>>   bpf: cpumap: Add gro support
>>>>>>>
>>>>>>>  include/linux/netdevice.h |   3 +
>>>>>>>  kernel/bpf/cpumap.c       | 123 ++++++++++++++++----------------------
>>>>>>>  net/core/dev.c            |  27 ++++++---
>>>>>>>  3 files changed, 73 insertions(+), 80 deletions(-)
>>>>>>>
>>>>>>> -- 
>>>>>>> 2.46.0
>>>>>>>
>>>>>>
>>>>>> Sorry about the long delay - finally caught up to everything after
>>>>>> conferences.
>>>>>>
>>>>>> I re-ran my synthetic tests (including baseline). v2 is somehow showing
>>>>>> 2x bigger gains than v1 (~30% vs ~14%) for tcp_stream. Again, the only
>>>>>> variable I changed is kernel version - steering prog is active for both.
>>>>>>
>>>>>>
>>>>>> Baseline (again)							
>>>>>>
>>>>>> ./tcp_rr -c -H $TASK_IP -p 50,90,99 -T4 -F8 -l30			        ./tcp_stream -c -H $TASK_IP -T8 -F16 -l30
>>>>>> 							
>>>>>> 	Transactions	Latency P50 (s)	Latency P90 (s)	Latency P99 (s)			Throughput (Mbit/s)
>>>>>> Run 1	2560252	        0.00009087	0.00010495	0.00011647		Run 1	15479.31
>>>>>> Run 2	2665517	        0.00008575	0.00010239	0.00013311		Run 2	15162.48
>>>>>> Run 3	2755939	        0.00008191	0.00010367	0.00012287		Run 3	14709.04
>>>>>> Run 4	2595680	        0.00008575	0.00011263	0.00012671		Run 4	15373.06
>>>>>> Run 5	2841865	        0.00007999	0.00009471	0.00012799		Run 5	15234.91
>>>>>> Average	2683850.6	0.000084854	0.00010367	0.00012543		Average	15191.76
>>>>>> 							
>>>>>> cpumap NAPI patches v2							
>>>>>> 							
>>>>>> 	Transactions	Latency P50 (s)	Latency P90 (s)	Latency P99 (s)			Throughput (Mbit/s)
>>>>>> Run 1	2577838	        0.00008575	0.00012031	0.00013695		Run 1	19914.56
>>>>>> Run 2	2729237	        0.00007551	0.00013311	0.00017663		Run 2	20140.92
>>>>>> Run 3	2689442	        0.00008319	0.00010495	0.00013311		Run 3	19887.48
>>>>>> Run 4	2862366	        0.00008127	0.00009471	0.00010623		Run 4	19374.49
>>>>>> Run 5	2700538	        0.00008319	0.00010367	0.00012799		Run 5	19784.49
>>>>>> Average	2711884.2	0.000081782	0.00011135	0.000136182		Average	19820.388
>>>>>> Delta	1.04%	        -3.62%	        7.41%	        8.57%			        30.47%
>>>>>>
>>>>>> Thanks,
>>>>>> Daniel
>>>>>
>>>>> Hi Daniel,
>>>>>
>>>>> cool, thx for testing it.
>>>>>
>>>>> @Olek: how do we want to proceed on it? Are you still working on it or do you want me
>>>>> to send a regular patch for it?
>>>>
>>>> Hi,
>>>>
>>>> I had a small vacation, sorry. I'm starting working on it again today.
>>>
>>> ack, no worries. Are you going to rebase the other patches on top of it
>>> or are you going to try a different approach?
>>
>> I'll try the approach without NAPI as Kuba asks and let Daniel test it,
>> then we'll see.
> 
> For now, I have the same results without NAPI as with your series, so
> I'll push it soon and let Daniel test.
> 
> (I simply decoupled GRO and NAPI and used the former in cpumap, but the
>  kthread logic didn't change)
> 
>>
>> BTW I'm curious how he got this boost on v2, from what I see you didn't
>> change the implementation that much?

Hi Daniel,

Sorry for the delay. Please test [0].

[0] https://github.com/alobakin/linux/commits/cpumap-old

Thanks,
Olek