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Message-ID: <20241103122138.6d0d62f6@kernel.org>
Date: Sun, 3 Nov 2024 12:21:38 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, Arthur Kiyanovski
 <akiyano@...zon.com>, Brett Creeley <brett.creeley@....com>, Broadcom
 internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>, Claudiu Manoil
 <claudiu.manoil@....com>, David Arinzon <darinzon@...zon.com>, "David S.
 Miller" <davem@...emloft.net>, Doug Berger <opendmb@...il.com>, Eric
 Dumazet <edumazet@...gle.com>, Eugenio PĂ©rez
 <eperezma@...hat.com>, Felix Fietkau <nbd@....name>, Florian Fainelli
 <florian.fainelli@...adcom.com>, Geetha sowjanya <gakula@...vell.com>,
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 Bianconi <lorenzo@...nel.org>, Louis Peens <louis.peens@...igine.com>, Mark
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 Michael Chan <michael.chan@...adcom.com>, "Michael S. Tsirkin"
 <mst@...hat.com>, Noam Dagan <ndagan@...zon.com>, Paolo Abeni
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 Mahameed <saeedm@...dia.com>, Sean Wang <sean.wang@...iatek.com>, Shannon
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 <tariqt@...dia.com>, Tony Nguyen <anthony.l.nguyen@...el.com>, Vladimir
 Oltean <vladimir.oltean@....com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
 intel-wired-lan@...ts.osuosl.org, linux-arm-kernel@...ts.infradead.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mediatek@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
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 oss-drivers@...igine.com, virtualization@...ts.linux.dev
Subject: Re: [resend PATCH 2/2] dim: pass dim_sample to net_dim() by
 reference

On Wed, 30 Oct 2024 18:23:26 -0600 Caleb Sander Mateos wrote:
> In a heavy TCP workload, mlx5e_handle_rx_dim() consumes 3% of CPU time,
> 94% of which is attributed to the first push instruction to copy
> dim_sample on the stack for the call to net_dim():

Change itself looks fine, so we can apply, but this seems surprising.
Are you sure this is not just some measurement problem?
Do you see 3% higher PPS with this change applied?

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