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From: "Björn Töpel" <bjorn.topel@intel.com>
To: "Maxim Mikityanskiy" <maximmi@nvidia.com>,
	"Björn Töpel" <bjorn.topel@gmail.com>,
	ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org,
	bpf@vger.kernel.org
Cc: magnus.karlsson@intel.com, maciej.fijalkowski@intel.com,
	kuba@kernel.org, jonathan.lemon@gmail.com, davem@davemloft.net,
	hawk@kernel.org, john.fastabend@gmail.com,
	ciara.loftus@intel.com, weqaar.a.janjua@intel.com
Subject: Re: [PATCH bpf-next v2 0/8] Introduce bpf_redirect_xsk() helper
Date: Wed, 20 Jan 2021 14:27:58 +0100	[thread overview]
Message-ID: <9fd68fd5-6a9f-3c36-1b83-4ba587387f5d@intel.com> (raw)
In-Reply-To: <7dcee85b-b3ef-947f-f433-03ad7066c5dd@nvidia.com>

On 2021-01-20 14:15, Maxim Mikityanskiy wrote:
> On 2021-01-19 17:50, Björn Töpel wrote:
>> This series extends bind() for XDP sockets, so that the bound socket
>> is added to the netdev_rx_queue _rx array in the netdevice. We call
>> this to register the socket. To redirect packets to the registered
>> socket, a new BPF helper is used: bpf_redirect_xsk().
>>
>> For shared XDP sockets, only the first bound socket is
>> registered. Users that need more complex setup has to use XSKMAP and
>> bpf_redirect_map().
>>
>> Now, why would one use bpf_redirect_xsk() over the regular
>> bpf_redirect_map() helper?
>>
>> * Better performance!
>> * Convenience; Most user use one socket per queue. This scenario is
>>    what registered sockets support. There is no need to create an
>>    XSKMAP. This can also reduce complexity from containerized setups,
>>    where users might what to use XDP sockets without CAP_SYS_ADMIN
>>    capabilities.
>>
>> The first patch restructures xdp_do_redirect() a bit, to make it
>> easier to add the new helper. This restructure also give us a slight
>> performance benefit. The following three patches extends bind() and
>> adds the new helper. After that, two libbpf patches that selects XDP
>> program based on what kernel is running. Finally, selftests for the new
>> functionality is added.
>>
>> Note that the libbpf "auto-selection" is based on kernel version, so
>> it is hard coded to the "-next" version (5.12). If you would like to
>> try this is out, you will need to change the libbpf patch locally!
>>
>> Thanks to Maciej and Magnus for the internal review/comments!
>>
>> Performance (rxdrop, zero-copy)
>>
>> Baseline
>> Two cores:                   21.3 Mpps
>> One core:                    24.5 Mpps
> 
> Two cores is slower? It used to be faster all the time, didn't it?
>

Up until busy-polling. Note that I'm using a busy-poll napi budget of 512.


>> Patched
>> Two cores, bpf_redirect_map: 21.7 Mpps + 2%
>> One core, bpf_redirect_map:  24.9 Mpps + 2%
>>
>> Two cores, bpf_redirect_xsk: 24.0 Mpps +13%
> 
> Nice, impressive improvement!
>

Thanks! Getting rid of the queue/netdev checks really payed off!


Björn

  reply	other threads:[~2021-01-20 20:10 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-19 15:50 Björn Töpel
2021-01-19 15:50 ` [PATCH bpf-next v2 1/8] xdp: restructure redirect actions Björn Töpel
2021-01-20 12:44   ` Toke Høiland-Jørgensen
2021-01-20 13:40     ` Björn Töpel
2021-01-20 14:52       ` Toke Høiland-Jørgensen
2021-01-20 15:49         ` Björn Töpel
2021-01-20 16:30           ` Toke Høiland-Jørgensen
2021-01-20 17:26             ` Björn Töpel
2021-01-19 15:50 ` [PATCH bpf-next v2 2/8] xsk: remove explicit_free parameter from __xsk_rcv() Björn Töpel
2021-01-19 15:50 ` [PATCH bpf-next v2 3/8] xsk: fold xp_assign_dev and __xp_assign_dev Björn Töpel
2021-01-19 15:50 ` [PATCH bpf-next v2 4/8] xsk: register XDP sockets at bind(), and add new AF_XDP BPF helper Björn Töpel
2021-01-20  8:25   ` kernel test robot
2021-01-20  8:41     ` Björn Töpel
2021-01-20  8:50   ` kernel test robot
2021-01-20 12:50   ` Toke Høiland-Jørgensen
2021-01-20 13:25     ` Björn Töpel
2021-01-20 14:54       ` Toke Høiland-Jørgensen
2021-01-20 15:18         ` Björn Töpel
2021-01-20 17:29           ` Toke Høiland-Jørgensen
2021-01-20 18:22             ` Björn Töpel
2021-01-20 20:26               ` Toke Høiland-Jørgensen
2021-01-20 21:15                 ` Alexei Starovoitov
2021-01-21  8:18                   ` Björn Töpel
2021-01-19 15:50 ` [PATCH bpf-next v2 5/8] libbpf, xsk: select AF_XDP BPF program based on kernel version Björn Töpel
2021-01-20 12:52   ` Toke Høiland-Jørgensen
2021-01-20 13:25     ` Björn Töpel
2021-01-20 14:49       ` Björn Töpel
2021-01-20 15:11         ` Toke Høiland-Jørgensen
2021-01-20 15:27           ` Björn Töpel
2021-01-20 17:30             ` Toke Høiland-Jørgensen
2021-01-20 18:25             ` Alexei Starovoitov
2021-01-20 18:30               ` Björn Töpel
2021-01-20 14:56       ` Toke Høiland-Jørgensen
2021-01-19 15:50 ` [PATCH bpf-next v2 6/8] libbpf, xsk: select bpf_redirect_xsk(), if supported Björn Töpel
2021-01-19 15:50 ` [PATCH bpf-next v2 7/8] selftest/bpf: add XDP socket tests for bpf_redirect_{xsk, map}() Björn Töpel
2021-01-21  7:39   ` Andrii Nakryiko
2021-01-21 12:31     ` Björn Töpel
2021-01-19 15:50 ` [PATCH bpf-next v2 8/8] selftest/bpf: remove a lot of ifobject casting in xdpxceiver Björn Töpel
2021-01-20 13:15 ` [PATCH bpf-next v2 0/8] Introduce bpf_redirect_xsk() helper Maxim Mikityanskiy
2021-01-20 13:27   ` Björn Töpel [this message]
2021-01-20 15:57   ` Jesper Dangaard Brouer
2021-01-20 16:19     ` Maciej Fijalkowski
2021-01-21 17:01       ` Jesper Dangaard Brouer
2021-01-22  8:59         ` Magnus Karlsson
2021-01-22  9:45           ` Maciej Fijalkowski

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