netdev - Re: [PATCH bpf-next v4 1/2] bpf, xdp: make bpf_redirect

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Date:   Fri, 26 Feb 2021 13:04:02 +0100
From:   Björn Töpel <bjorn.topel@...el.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Björn Töpel <bjorn.topel@...il.com>,
        ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     maciej.fijalkowski@...el.com, hawk@...nel.org,
        magnus.karlsson@...el.com, john.fastabend@...il.com,
        kuba@...nel.org, davem@...emloft.net
Subject: Re: [PATCH bpf-next v4 1/2] bpf, xdp: make bpf_redirect_map() a map
 operation


On 2021-02-26 12:40, Björn Töpel wrote:
> On 2021-02-26 12:37, Toke Høiland-Jørgensen wrote:

[...]

>>
>> (That last paragraph above is why I asked if you updated the performance
>> numbers in the cover letter; removing an additional function call should
>> affect those, right?)
>>
> 
> Yeah, it should. Let me spend some more time benchmarking on the DEVMAP
> scenario.
>

I did a re-measure using samples/xdp_redirect_map.

The setup is 64B packets blasted to an i40e. As a baseline,

   # xdp_rxq_info --dev ens801f1 --action XDP_DROP

gives 24.8 Mpps.


Now, xdp_redirect_map. Same NIC, two ports, receive from port A,
redirect to port B:

baseline:    14.3 Mpps
this series: 15.4 Mpps

which is almost 8%!


Björn