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Message-ID: <ZeIaI4TNqXSxU4LX@google.com>
Date: Fri, 1 Mar 2024 10:10:43 -0800
From: Stanislav Fomichev <sdf@...gle.com>
To: Song Yoong Siang <yoong.siang.song@...el.com>
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony Nguyen <anthony.l.nguyen@...el.com>,
"David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Richard Cochran <richardcochran@...il.com>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>, Vinicius Costa Gomes <vinicius.gomes@...el.com>,
Florian Bezdeka <florian.bezdeka@...mens.com>, Andrii Nakryiko <andrii@...nel.org>,
Eduard Zingerman <eddyz87@...il.com>, Mykola Lysenko <mykolal@...com>,
Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>,
intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org, xdp-hints@...-project.net
Subject: Re: [PATCH iwl-next,v2 1/2] selftests/bpf: xdp_hw_metadata reduce
sleep interval
On 03/02, Song Yoong Siang wrote:
> In current ping-pong design, xdp_hw_metadata will wait until the packet
> transmition completely done, then only start to receive the next packet.
>
> The current sleep interval is 10ms, which is unnecessary large. Typically,
> a NIC does not need such a long time to transmit a packet. Furthermore,
> during this 10ms sleep time, the app is unable to receive incoming packets.
>
> Therefore, this commit reduce sleep interval to 10us, so that
> xdp_hw_metadata able to support periodic packets with shorter interval.
> 10us * 500 = 5ms should be enough for packet transmission and status
> retrival.
>
> Signed-off-by: Song Yoong Siang <yoong.siang.song@...el.com>
Acked-by: Stanislav Fomichev <sdf@...gle.com>
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