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Date: Thu, 6 Oct 2022 10:37:48 +0200
From: Jesper Dangaard Brouer <jbrouer@...hat.com>
To: Shenwei Wang <shenwei.wang@....com>,
Jesper Dangaard Brouer <jbrouer@...hat.com>,
Andrew Lunn <andrew@...n.ch>
Cc: brouer@...hat.com, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
Magnus Karlsson <magnus.karlsson@...il.com>,
Björn Töpel <bjorn@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>
Subject: Re: [EXT] Re: [PATCH 1/1] net: fec: add initial XDP support
On 05/10/2022 14.40, Shenwei Wang wrote:
> Hi Jesper,
>
> Here is the summary of "xdp_rxq_info" testing.
>
> skb_mark_for_recycle page_pool_release_page
>
> Native SKB-Mode Native SKB-Mode
> XDP_DROP 460K 220K 460K 102K
> XDP_PASS 80K 113K 60K 62K
>
It is very pleasing to see the *huge* performance benefit that page_pool
provide when recycling pages for SKBs (via skb_mark_for_recycle).
I did expect a performance boost, but not around a x2 performance boost.
I guess this platform have a larger overhead for DMA-mapping and
page-allocation.
IMHO it would be valuable to include this result as part of the patch
description when you post the XDP patch again.
Only strange result is XDP_PASS 'Native' is slower that 'SKB-mode'. I
cannot explain why, as XDP_PASS essentially does nothing and just follow
normal driver code to netstack.
Thanks a lot for doing these tests.
--Jesper
> The following are the testing log.
>
> Thanks,
> Shenwei
>
> ### skb_mark_for_recycle solution ###
>
> ./xdp_rxq_info --dev eth0 --act XDP_DROP --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_DROP options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 466,553 0
> XDP-RX CPU total 466,553
>
> ./xdp_rxq_info -S --dev eth0 --act XDP_DROP --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_DROP options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 226,272 0
> XDP-RX CPU total 226,272
>
> ./xdp_rxq_info --dev eth0 --act XDP_PASS --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_PASS options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 80,518 0
> XDP-RX CPU total 80,518
>
> ./xdp_rxq_info -S --dev eth0 --act XDP_PASS --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_PASS options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 113,681 0
> XDP-RX CPU total 113,681
>
>
> ### page_pool_release_page solution ###
>
> ./xdp_rxq_info --dev eth0 --act XDP_DROP --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_DROP options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 463,145 0
> XDP-RX CPU total 463,145
>
> ./xdp_rxq_info -S --dev eth0 --act XDP_DROP --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_DROP options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 104,443 0
> XDP-RX CPU total 104,443
>
> ./xdp_rxq_info --dev eth0 --act XDP_PASS --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_PASS options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 60,539 0
> XDP-RX CPU total 60,539
>
> ./xdp_rxq_info -S --dev eth0 --act XDP_PASS --read
>
> Running XDP on dev:eth0 (ifindex:2) action:XDP_PASS options:read
> XDP stats CPU pps issue-pps
> XDP-RX CPU 0 62,566 0
> XDP-RX CPU total 62,566
>
>> -----Original Message-----
>> From: Shenwei Wang
>> Sent: Tuesday, October 4, 2022 8:34 AM
>> To: Jesper Dangaard Brouer <jbrouer@...hat.com>; Andrew Lunn
>> <andrew@...n.ch>
>> Cc: brouer@...hat.com; David S. Miller <davem@...emloft.net>; Eric Dumazet
>> <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni
>> <pabeni@...hat.com>; Alexei Starovoitov <ast@...nel.org>; Daniel Borkmann
>> <daniel@...earbox.net>; Jesper Dangaard Brouer <hawk@...nel.org>; John
>> Fastabend <john.fastabend@...il.com>; netdev@...r.kernel.org; linux-
>> kernel@...r.kernel.org; imx@...ts.linux.dev; Magnus Karlsson
>> <magnus.karlsson@...il.com>; Björn Töpel <bjorn@...nel.org>; Ilias
>> Apalodimas <ilias.apalodimas@...aro.org>
>> Subject: RE: [EXT] Re: [PATCH 1/1] net: fec: add initial XDP support
>>
>>
>>
>>> -----Original Message-----
>>> From: Shenwei Wang
>>> Sent: Tuesday, October 4, 2022 8:13 AM
>>> To: Jesper Dangaard Brouer <jbrouer@...hat.com>; Andrew Lunn
>> ...
>>> I haven't tested xdp_rxq_info yet, and will have a try sometime later today.
>>> However, for the XDP_DROP test, I did try xdp2 test case, and the
>>> testing result looks reasonable. The performance of Native mode is
>>> much higher than skb- mode.
>>>
>>> # xdp2 eth0
>>> proto 0: 475362 pkt/s
>>>
>>> # xdp2 -S eth0 (page_pool_release_page solution)
>>> proto 17: 71999 pkt/s
>>>
>>> # xdp2 -S eth0 (skb_mark_for_recycle solution)
>>> proto 17: 72228 pkt/s
>>>
>>
>> Correction for xdp2 -S eth0 (skb_mark_for_recycle solution)
>> proto 0: 0 pkt/s
>> proto 17: 122473 pkt/s
>>
>> Thanks,
>> Shenwei
>
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