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

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Message-Id: <a2ebba59-bf19-4bb9-9952-c2f63123b7cd@app.fastmail.com>
Date: Mon, 25 Nov 2024 16:56:49 -0600
From: "Daniel Xu" <dxu@...uu.xyz>
To: "Alexander Lobakin" <aleksander.lobakin@...el.com>
Cc: "Lorenzo Bianconi" <lorenzo@...nel.org>,
 "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
 "Jakub Kicinski" <kuba@...nel.org>, "Alexei Starovoitov" <ast@...nel.org>,
 "Daniel Borkmann" <daniel@...earbox.net>,
 "Andrii Nakryiko" <andrii@...nel.org>,
 "John Fastabend" <john.fastabend@...il.com>,
 "Jesper Dangaard Brouer" <hawk@...nel.org>,
 "Martin KaFai Lau" <martin.lau@...ux.dev>,
 "David Miller" <davem@...emloft.net>, "Eric Dumazet" <edumazet@...gle.com>,
 "Paolo Abeni" <pabeni@...hat.com>, netdev@...r.kernel.org,
 "Lorenzo Bianconi" <lorenzo.bianconi@...hat.com>
Subject: Re: [RFC/RFT v2 0/3] Introduce GRO support to cpumap codebase



On Mon, Nov 25, 2024, at 9:12 AM, Alexander Lobakin wrote:
> From: Daniel Xu <dxu@...uu.xyz>
> Date: Fri, 22 Nov 2024 17:10:06 -0700
>
>> Hi Olek,
>> 
>> Here are the results.
>> 
>> On Wed, Nov 13, 2024 at 03:39:13PM GMT, Daniel Xu wrote:
>>>
>>>
>>> On Tue, Nov 12, 2024, at 9:43 AM, Alexander Lobakin wrote:
>
> [...]
>
>> Baseline (again)
>> 
>> 	Transactions	Latency P50 (s)	Latency P90 (s)	Latency P99 (s)			Throughput (Mbit/s)
>> Run 1	3169917	        0.00007295	0.00007871	0.00009343		Run 1	21749.43
>> Run 2	3228290	        0.00007103	0.00007679	0.00009215		Run 2	21897.17
>> Run 3	3226746	        0.00007231	0.00007871	0.00009087		Run 3	21906.82
>> Run 4	3191258	        0.00007231	0.00007743	0.00009087		Run 4	21155.15
>> Run 5	3235653	        0.00007231	0.00007743	0.00008703		Run 5	21397.06
>> Average	3210372.8	0.000072182	0.000077814	0.00009087		Average	21621.126
>> 
>> cpumap v2 Olek
>> 
>> 	Transactions	Latency P50 (s)	Latency P90 (s)	Latency P99 (s)			Throughput (Mbit/s)
>> Run 1	3253651	        0.00007167	0.00007807	0.00009343		Run 1	13497.57
>> Run 2	3221492	        0.00007231	0.00007743	0.00009087		Run 2	12115.53
>> Run 3	3296453	        0.00007039	0.00007807	0.00009087		Run 3	12323.38
>> Run 4	3254460	        0.00007167	0.00007807	0.00009087		Run 4	12901.88
>> Run 5	3173327	        0.00007295	0.00007871	0.00009215		Run 5	12593.22
>> Average	3239876.6	0.000071798	0.00007807	0.000091638		Average	12686.316
>> Delta	0.92%	        -0.53%	        0.33%	        0.85%			        -41.32%
>> 
>> 
>> It's very interesting that we see -40% tput w/ the patches. I went back
>
> Oh no, I messed up something =\
>
> Could you please also test not the whole series, but patches 1-3 (up to
> "bpf:cpumap: switch to GRO...") and 1-4 (up to "bpf: cpumap: reuse skb
> array...")? Would be great to see whether this implementation works
> worse right from the start or I just broke something later on.

Patches 1-3 reproduces the -40% tput numbers. 

With patches 1-4 the numbers get slightly worse (~1gbps lower) but it was noisy.

tcp_rr results were unaffected.

Thanks,
Daniel