From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B0AEB38E8B7 for ; Wed, 1 Jul 2026 19:08:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782932918; cv=none; b=NHM8K0bIhiiyIJiHbp8WorskCV2eD386KUxAhj/TS7jtbWIsRLbG2NNBvanfTFSzYfh8Y3GdczyvIXfoVfr9fcjJ4iRaUOKTcb3v9bBwD8okS2ZR533xWjPkz9zBc7srwQy7m0MY6leWdMsOpjBQj5HScXDdGiOpPG6y6hnBjq4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782932918; c=relaxed/simple; bh=/caxDomtmq3CZidESZwEmWi8gpBX1dAxgotRykfCjxg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=hHq6c0GNAQdDnMBj7tr1FtLSKsVHcsQNA8BBxchsSP8oduR3R3ewZKkT6aWEBXQO1JgyplNUzhKHzhLUEEcL9m9AeoqwTSgIYV48ucKyQ8iMaHovi2f+glQlmjAY7/s+HGwirVilq41iTILwL6ozVikgp7CbaMxH53+nL/CvsaM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=JjkJ/n9S; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=hxWi2yqA; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="JjkJ/n9S"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="hxWi2yqA" Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 661GmXWi1630416 for ; Wed, 1 Jul 2026 19:08:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= jlmev16MCLxmtjyWUwIYdrZl69vYkO/mRgghdSSAFbs=; b=JjkJ/n9S4b+2dWO8 3OEUOytYqVn6k4LaJuVP1dfjfg3FjyONoNJ+qvtms4Mp5zYx77jO3bjtLeUs4iOK tEzbez+hDvSTaLg8fvmdd70ITrC3tykkCrFwHqV0hXYJdoNv4jhszWZlj6zaFfqU DqMFh3CN1pYx8qk6+Udg2tcmL+t9DmgKSHoA3HlHCpvyZCyiHfVzvBsCIPQIWqZy Erf+CFrORuyIkmfo81BR6wn2BaHuzBmLWMN2k/2eqLBcn6aOLHs+Okqjwtwt+hIv FQdkQgB++VODJjToxSQ1fPmk58fkbPlIfirfFFfchTpjNzE0jqx3X9zx1bNIut/g WBhOKw== Received: from mail-pj1-f71.google.com (mail-pj1-f71.google.com [209.85.216.71]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4f563mgrjq-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Wed, 01 Jul 2026 19:08:36 +0000 (GMT) Received: by mail-pj1-f71.google.com with SMTP id 98e67ed59e1d1-37e16f658abso794643a91.1 for ; Wed, 01 Jul 2026 12:08:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1782932916; x=1783537716; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to:content-type; bh=jlmev16MCLxmtjyWUwIYdrZl69vYkO/mRgghdSSAFbs=; b=hxWi2yqAdEb/XDmeGqndVIslFraCIyiuOq8Or8o0qoS71rieh44TIaUXQnXkn1hVHd idtCNAHKgBL+KeSVfexrBJfY83D2JkVI3UeaEvSXTA98Kfnr5PRg5UkWQyfsXc8M1vaS iGudOmU85s8OVNTR9Yzvomcgz1FN4LhM8z0AHqZYnmMWxCk/WWt3MgXFjKRTFanwBgAK b1ZLuPS5IaDlX6/qG9K8PiaVOFmbDEEQeKMN6FQiYQzzW2meLDr8L7FPR4oqvPdLsJVn p0dn+5FGKORP3Wh9BwLlhK8T7LjMzqIVDBqBQkfy6fi3odkQgledgm+PPuxLZ1R3jqdD 95vA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782932916; x=1783537716; h=content-transfer-encoding:content-type:in-reply-to:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=jlmev16MCLxmtjyWUwIYdrZl69vYkO/mRgghdSSAFbs=; b=js/GCz8KW7F6S0aSXcygpOWocTusUZqZSgfUqF1wrFNo2chBWAhG1WoPxPHDPQWIlW xDfLn3WxPmh4IS9+3AuPKFEmzjCBEzp2AX67xRDkrhFy+lELSjpvIJ0r5NsQPYiMvK9c lyMbHELYuY5VrjWKgtQC18B2d7TiLDGRp/g57PqMSophfpAYA11olKX+GSMYJjOYkEx4 LFZBrL3eRF2S/QFRzjMzSQoh8u9hrUy8e6lZdcDM/9XJH+nsYSkxbu5Z6LtWwqSc2i/6 2yE3/u0HXDkhIiyc/lgAgmYQ1KNI9lciBS3kPkXxPy0oYgnUb7WDmFNPFlGMca4SxjX3 9eyA== X-Forwarded-Encrypted: i=1; AHgh+Rom9rdse+o5k5+M6NnV07TneMHFS778K5x0+fDU0nMC0DjFpQuyIa3kDvE2SDe12xr/Gv+bddVZQZw6mgs=@vger.kernel.org X-Gm-Message-State: AOJu0YzVYiacyQ5MbEQ7/G5U1TQIw4xbSAY8gg6SImEUsoC3/bZ47x1y Z0ujOX1gL5qojeVBmBGWSNidl8BepoAWAaAZp6bVp2JvnE8fatDFPDbmAl8XZOXmT5j7JckmxXo Wa/MFSwpfhvJtJYRRaon2lxcrNSzLQXcDkJxeyEGpZ7BiJGX8vAdViZWFngm7HyLvflM= X-Gm-Gg: AfdE7cnd/OtDnRtV6UF2zNK0aRptavIYjHZNScuAeEFBg6g5ZP6p4d/I1BxnLjtYzEf 88/XrkEbTtC7PCi5fS8Jtggh0SQU0B9omKEv4CybiidoJrPobf7tRqrnhuu9FtgLMZ2LA0fk16b cgaNLad1u48S90yP9cUWaj1nUHRrFytadZKb/p+6opY1hCMbwEMc3G676BbxhrH66QxLzk1bkiI XWbiM82Tb2ks3h2sjhfNmjElTQytbJy0zd0/aJm0c9B4Db88UBzPGoojCcCup0sOMYr//vx+ScR Cwz90+OFo1ui3oxCjKxSkPTwyeEi6e2sjQsRvcM9Ufmq3+ruLK3RYaXULvWCNIFCsgyx2ZznQMF D3NeSVSiUTvooUMD/8hVxRim3weBmV8c/sCs2uga+HCEVF8Yxns/6ruUtygRhVbsKknNmdcA= X-Received: by 2002:a17:90b:1dc8:b0:37f:9ce1:735f with SMTP id 98e67ed59e1d1-380ba94a632mr2036069a91.32.1782932916301; Wed, 01 Jul 2026 12:08:36 -0700 (PDT) X-Received: by 2002:a17:90b:1dc8:b0:37f:9ce1:735f with SMTP id 98e67ed59e1d1-380ba94a632mr2036036a91.32.1782932915853; Wed, 01 Jul 2026 12:08:35 -0700 (PDT) Received: from [10.227.110.203] (i-global254.qualcomm.com. [199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30f0bbd2362sm535918eec.20.2026.07.01.12.08.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Jul 2026 12:08:35 -0700 (PDT) Message-ID: <079f2b0f-87f5-40bf-b36e-3ed01592e937@oss.qualcomm.com> Date: Wed, 1 Jul 2026 12:08:34 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] wifi: ath: avoid repeated divisions in DFS PRI detector To: frank0988 , Jeff Johnson Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260701170424.380202-1-frank0988855428@gmail.com> From: Jeff Johnson Content-Language: en-US In-Reply-To: <20260701170424.380202-1-frank0988855428@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: kBpjM5sNw-33WLrTy7ZE_KmRt7spjghe X-Proofpoint-ORIG-GUID: kBpjM5sNw-33WLrTy7ZE_KmRt7spjghe X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAxMDIwNSBTYWx0ZWRfXx7fjZZdFltg5 fROWyBINEEP5Bq8hEQAEz6eG7HHNQCEWqR2FiJTBNF70G5nnQgs02p/qNBxIbOYK0mC0jhgqQKB HXs8gBB/plKob8B3SDkD/ikONP/rTp0xfyxC22AQVg4sjpOfdX8KNfQ60cb8986ydsclgY9LBDJ LyyoEoTkoh7bK9t86BYoW3ItrXsMxPi2XxMsRim5tOtQAe6KHXJ0QhAT4M1CiMy5GTyPERtbANj pNIWWf06pSjrIpLayJXX2OKDC+wGEfAJTNR7jOddYcjjGoqpuuNHcAPYeuI/YVq586T1wxcQKnx NQsEc6XTWeWQkRIM9gV9fVufIlLpLYQCscfsSYfZQJVyp3H7ffD/cFm2FlBUMan7QV2ynkGVWht YTBoY02MfbsbJO/dzpM83TMRPN+Z4I8SZDXmU5kHbpVKVnBbJUxdDBTd9BwWXGvZun03YpmaDUF VKrGml/stN6LxeUxXLw== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAxMDIwNSBTYWx0ZWRfXwPzl8khV8tvm OavpHgZBJjNXACzdIELfaglAlTyh8M5LW0r4p2LxzdkTbJ4DE5GnnQPatJQLaQr3ybMce5OVhZO d3vHI4+C8Og9hOsSuKSE5JAkdR4EfKY= X-Authority-Analysis: v=2.4 cv=UopT8ewB c=1 sm=1 tr=0 ts=6a4565b5 cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=ba6CMTNMOfQxLYHywM4A:9 a=QEXdDO2ut3YA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-07-01_04,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 phishscore=0 impostorscore=0 clxscore=1015 bulkscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607010205 On 7/1/2026 10:04 AM, frank0988 wrote: > pde_get_multiple() is called repeatedly with the same PRI (Pulse > Repetition Interval) value while validating candidate and existing PRI > sequences. > > Cache the reciprocal value for each sequence structure and leverage > reciprocal_divide() in the hot path. This keeps the existing matching > logic and tolerance checks intact while replacing expensive hardware > integer divisions with low-cost multiply-and-shift operations. > > Testing with a userspace model of the same detector logic demonstrated > identical detector states and outputs across 100 verification traces. > To eliminate memory allocator noise, an isolated micro-benchmark using > a static object pool showed that the reciprocal variant reduces CPU > cycles by approximately 3.4%. > > Signed-off-by: frank0988 You must sign off with a "known identity" https://www.kernel.org/doc/html/latest/process/submitting-patches.html#developer-s-certificate-of-origin-1-1