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Miller" , Doug Berger , Eric Dumazet , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Felix Fietkau , Geetha sowjanya , hariprasad , Jakub Kicinski , Jason Wang , Jonathan Corbet , Leon Romanovsky , Lorenzo Bianconi , Louis Peens , Mark Lee , Matthias Brugger , Michael Chan , "Michael S. Tsirkin" , Noam Dagan , Paolo Abeni , Przemek Kitszel , Roy Pledge , Saeed Bishara , Saeed Mahameed , Sean Wang , Shannon Nelson , Shay Agroskin , Simon Horman , Subbaraya Sundeep , Sunil Goutham , Tal Gilboa , Tariq Toukan , Tony Nguyen , Vladimir Oltean , Xuan Zhuo Cc: intel-wired-lan@lists.osuosl.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, oss-drivers@corigine.com, virtualization@lists.linux.dev References: <20241031002326.3426181-1-csander@purestorage.com> <20241031002326.3426181-2-csander@purestorage.com> Content-Language: en-US From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; keydata= xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB IQQQAQgAywUCZWl41AUJI+Jo+hcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFr ZXktdXNhZ2UtbWFza0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2Rp bmdAcGdwLmNvbXBncG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29t Lm5ldAUbAwAAAAMWAgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagAAoJEIEx tcQpvGagWPEH/2l0DNr9QkTwJUxOoP9wgHfmVhqc0ZlDsBFv91I3BbhGKI5UATbipKNqG13Z TsBrJHcrnCqnTRS+8n9/myOF0ng2A4YT0EJnayzHugXm+hrkO5O9UEPJ8a+0553VqyoFhHqA zjxj8fUu1px5cbb4R9G4UAySqyeLLeqnYLCKb4+GklGSBGsLMYvLmIDNYlkhMdnnzsSUAS61 WJYW6jjnzMwuKJ0ZHv7xZvSHyhIsFRiYiEs44kiYjbUUMcXor/uLEuTIazGrE3MahuGdjpT2 IOjoMiTsbMc0yfhHp6G/2E769oDXMVxCCbMVpA+LUtVIQEA+8Zr6mX0Yk4nDS7OiBlvOwE0E U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+ obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us= In-Reply-To: <20241031002326.3426181-2-csander@purestorage.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Fri, 01 Nov 2024 15:30:43 +0000 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1730395050; x=1730999850; darn=lists.osuosl.org; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to; bh=yuVL5XevAlSQZiTVvR3V3r/+5ebo7kY9AfDcEkuoaT4=; b=AQ5Q/E05fgvXDr7naKiMHSyouxA90TkYcH1P9Q5ITpfvYzuJvk92gYe1FxcgrIkywh ZhN6q19NizlCuveY3gMm7cYnWwHDDZrsV/IdMoPEONfUAhwnDAFiquBLF6PnCraLTVRc QPQJBnwwQJPTNQ869Quq32hM/kIsW+t7+WsQo= X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.a=rsa-sha256 header.s=google header.b=AQ5Q/E05 Subject: Re: [Intel-wired-lan] [resend PATCH 2/2] dim: pass dim_sample to net_dim() by reference X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 10/30/24 17:23, Caleb Sander Mateos wrote: > net_dim() is currently passed a struct dim_sample argument by value. > struct dim_sample is 24 bytes. Since this is greater 16 bytes, x86-64 > passes it on the stack. All callers have already initialized dim_sample > on the stack, so passing it by value requires pushing a duplicated copy > to the stack. Either witing to the stack and immediately reading it, or > perhaps dereferencing addresses relative to the stack pointer in a chain > of push instructions, seems to perform quite poorly. > > 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(): > // Call ktime_get() > 0.26 |4ead2: call 4ead7 > // Pass the address of struct dim in %rdi > |4ead7: lea 0x3d0(%rbx),%rdi > // Set dim_sample.pkt_ctr > |4eade: mov %r13d,0x8(%rsp) > // Set dim_sample.byte_ctr > |4eae3: mov %r12d,0xc(%rsp) > // Set dim_sample.event_ctr > 0.15 |4eae8: mov %bp,0x10(%rsp) > // Duplicate dim_sample on the stack > 94.16 |4eaed: push 0x10(%rsp) > 2.79 |4eaf1: push 0x10(%rsp) > 0.07 |4eaf5: push %rax > // Call net_dim() > 0.21 |4eaf6: call 4eafb > > To allow the caller to reuse the struct dim_sample already on the stack, > pass the struct dim_sample by reference to net_dim(). > > Signed-off-by: Caleb Sander Mateos Reviewed-by: Florian Fainelli #bcm{sysport,genet}.c Thanks! -- Florian