[{"id":38208,"web_url":"https://patchwork.libcamera.org/comment/38208/","msgid":"<177131770050.1178617.13545189964232308183@ping.linuxembedded.co.uk>","date":"2026-02-17T08:41:40","subject":"Re: [PATCH 0/5] software_isp: debayer_cpu: Add multi-threading\n\tsupport","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Hi Hans,\n\nQuoting Hans de Goede (2026-02-16 19:01:59)\n> Hi All,\n> \n> The QCM2290 SoC used on the Arduino Uno-Q seems to have a very weak GPU(1),\n> so weak that it is barely faster then a single CPU core.\n> \n> This has made me code-up the long envisioned multi-threading support\n> for the CPU softISP :)\n> \n> Benchmark results for the Uno-Q + IMX219 running at 3280x2464 -> 3272x2464:\n\nI'm afraid I think there are CI failures in this branch:\n\nhttps://gitlab.freedesktop.org/camera/libcamera/-/jobs/93408936#L538\n\n> \n> 1 thread : 147ms / frame, ~6.5 fps\n> 2 threads: 81ms / frame, ~12 fps\n> 3 threads: 66ms / frame, ~14.5 fps\n> GPU: 130ms / frame, ~7,5 fps\n> GPU 0-copy: 110ms / frame, ~9.5 fps (requires pipeline + camss hacks)\n> GPU lite: 85ms / frame, ~12 fps (CCM, contrast and gamma disabled)\n> \n> Regards,\n> \n> Hans\n> \n> 1) If the GPU really is this weak needs to be investigated more\n> \n> Hans de Goede (5):\n> software_isp: swstats_cpu: Move accumulator storage out of the class\n> software_isp: debayer_cpu: Add per render thread data\n> software_isp: debayer_cpu: Group innerloop variables together\n> software_isp: debayer_cpu: Select process inner loop by function\n> pointer\n> software_isp: debayer_cpu: Add multi-threading support\n> \n> .../internal/software_isp/swstats_cpu.h | 29 ++--\n> src/libcamera/software_isp/debayer_cpu.cpp | 131 ++++++++++++------\n> src/libcamera/software_isp/debayer_cpu.h | 44 ++++--\n> src/libcamera/software_isp/swstats_cpu.cpp | 65 ++++++---\n> 4 files changed, 180 insertions(+), 89 deletions(-)\n> \n> -- \n> 2.52.0\n>","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 32543C31E9\n\tfor ;\n\tTue, 17 Feb 2026 08:41:46 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 5763162210;\n\tTue, 17 Feb 2026 09:41:45 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 4CD42620C9\n\tfor ;\n\tTue, 17 Feb 2026 09:41:43 +0100 (CET)","from monstersaurus.ideasonboard.com\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id ACEDB161;\n\tTue, 17 Feb 2026 09:40:51 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"rnzPJJ1n\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1771317651;\n\tbh=mgwFPBw9bvbK0mbkFp6BKDvzArTsXHCka8EQcAMELhI=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=rnzPJJ1nqi9AgC/fPNnoSAieHQUpnHJRXrwZ6k4MWaYBpVQ4zVgg10UOoZKYMfR5r\n\tKSZC3waH2a1zlLSsEMw8kUeM2muVsKt4HO6d0l7hCbl1iNuFKoT8miolquqHYUaiR5\n\tRoH3lV7jbp8DJAY3LS5sh2KDO13cwRZ8xjWrthhU=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20260216190204.106922-1-johannes.goede@oss.qualcomm.com>","References":"<20260216190204.106922-1-johannes.goede@oss.qualcomm.com>","Subject":"Re: [PATCH 0/5] software_isp: debayer_cpu: Add multi-threading\n\tsupport","From":"Kieran Bingham ","Cc":"Hans de Goede ","To":"Hans de Goede ,\n\tMilan Zamazal , libcamera-devel@lists.libcamera.org","Date":"Tue, 17 Feb 2026 08:41:40 +0000","Message-ID":"<177131770050.1178617.13545189964232308183@ping.linuxembedded.co.uk>","User-Agent":"alot/0.9.1","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":38219,"web_url":"https://patchwork.libcamera.org/comment/38219/","msgid":"<85y0kr9gk9.fsf@mzamazal-thinkpadp1gen7.tpbc.csb>","date":"2026-02-17T22:00:06","subject":"Re: [PATCH 0/5] software_isp: debayer_cpu: Add multi-threading\n\tsupport","submitter":{"id":177,"url":"https://patchwork.libcamera.org/api/people/177/","name":"Milan Zamazal","email":"mzamazal@redhat.com"},"content":"Hans de Goede writes:\n\n> Hi All,\n>\n> The QCM2290 SoC used on the Arduino Uno-Q seems to have a very weak GPU(1),\n> so weak that it is barely faster then a single CPU core.\n>\n> This has made me code-up the long envisioned multi-threading support\n> for the CPU softISP :)\n\nReason to not drop CPU ISP in future?\n\n> Benchmark results for the Uno-Q + IMX219 running at 3280x2464 -> 3272x2464:\n>\n> 1 thread : 147ms / frame, ~6.5 fps\n> 2 threads: 81ms / frame, ~12 fps\n> 3 threads: 66ms / frame, ~14.5 fps\n> GPU: 130ms / frame, ~7,5 fps\n> GPU 0-copy: 110ms / frame, ~9.5 fps (requires pipeline + camss hacks)\n> GPU lite: 85ms / frame, ~12 fps (CCM, contrast and gamma disabled)\n\nThe CPU measurements are with or without CCM?\n\n> Regards,\n>\n> Hans\n>\n> 1) If the GPU really is this weak needs to be investigated more\n>\n> Hans de Goede (5):\n> software_isp: swstats_cpu: Move accumulator storage out of the class\n> software_isp: debayer_cpu: Add per render thread data\n> software_isp: debayer_cpu: Group innerloop variables together\n> software_isp: debayer_cpu: Select process inner loop by function\n> pointer\n> software_isp: debayer_cpu: Add multi-threading support\n>\n> .../internal/software_isp/swstats_cpu.h | 29 ++--\n> src/libcamera/software_isp/debayer_cpu.cpp | 131 ++++++++++++------\n> src/libcamera/software_isp/debayer_cpu.h | 44 ++++--\n> src/libcamera/software_isp/swstats_cpu.cpp | 65 ++++++---\n> 4 files changed, 180 insertions(+), 89 deletions(-)","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 1DD4BC31E9\n\tfor ;\n\tTue, 17 Feb 2026 22:00:15 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 4EC4F62215;\n\tTue, 17 Feb 2026 23:00:14 +0100 (CET)","from us-smtp-delivery-124.mimecast.com\n\t(us-smtp-delivery-124.mimecast.com [170.10.129.124])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 2470661FA0\n\tfor ;\n\tTue, 17 Feb 2026 23:00:13 +0100 (CET)","from mail-wr1-f71.google.com (mail-wr1-f71.google.com\n\t[209.85.221.71]) by relay.mimecast.com with ESMTP with STARTTLS\n\t(version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id\n\tus-mta-13-fc9UuLk7PjG10KGI8bI61Q-1; 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It will therefore slow down.\n\nThe right solution to this problem is to support the hardware ISP\nincluded in the QCM2290 :-)\n\n> > Benchmark results for the Uno-Q + IMX219 running at 3280x2464 -> 3272x2464:\n> >\n> > 1 thread : 147ms / frame, ~6.5 fps\n> > 2 threads: 81ms / frame, ~12 fps\n> > 3 threads: 66ms / frame, ~14.5 fps\n> > GPU: 130ms / frame, ~7,5 fps\n> > GPU 0-copy: 110ms / frame, ~9.5 fps (requires pipeline + camss hacks)\n> > GPU lite: 85ms / frame, ~12 fps (CCM, contrast and gamma disabled)\n> \n> The CPU measurements are with or without CCM?\n> \n> > Regards,\n> >\n> > Hans\n> >\n> > 1) If the GPU really is this weak needs to be investigated more\n> >\n> > Hans de Goede (5):\n> > software_isp: swstats_cpu: Move accumulator storage out of the class\n> > software_isp: debayer_cpu: Add per render thread data\n> > software_isp: debayer_cpu: Group innerloop variables together\n> > software_isp: debayer_cpu: Select process inner loop by function\n> > pointer\n> > software_isp: debayer_cpu: Add multi-threading support\n> >\n> > .../internal/software_isp/swstats_cpu.h | 29 ++--\n> > src/libcamera/software_isp/debayer_cpu.cpp | 131 ++++++++++++------\n> > src/libcamera/software_isp/debayer_cpu.h | 44 ++++--\n> > src/libcamera/software_isp/swstats_cpu.cpp | 65 ++++++---\n> > 4 files changed, 180 insertions(+), 89 deletions(-)","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 03BF6C0DA4\n\tfor ;\n\tThu, 19 Feb 2026 14:12:59 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id A86D5620C9;\n\tThu, 19 Feb 2026 15:12:58 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 192C4620C9\n\tfor ;\n\tThu, 19 Feb 2026 15:12:57 +0100 (CET)","from killaraus.ideasonboard.com (unknown [83.245.237.175])\n\tby perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id 9BC314D3;\n\tThu, 19 Feb 2026 15:12:03 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"oAxYIweb\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1771510324;\n\tbh=BWeABwJ6mf1OeTi5jJRkRR9QnmuZR27LlPBU21h38J4=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=oAxYIwebxlAUgvI2sFOx5GvF5AM8kGulZ1FYTBxTEEgLawUCapDvsY+nJNKp9z1SF\n\tjI/j7pgd3xB3HfgEO5W7WGiu4OX0fbilWpaBMZwXRyCc3JmkBs6RLVmpkV7VdgW2yX\n\tNWyunDWUnAZimXt3cNTwR7wQea6Zs3lPPUF1wbF0=","Date":"Thu, 19 Feb 2026 15:12:53 +0100","From":"Laurent Pinchart ","To":"Milan Zamazal ","Cc":"Hans de Goede ,\n\tlibcamera-devel@lists.libcamera.org","Subject":"Re: [PATCH 0/5] software_isp: debayer_cpu: Add multi-threading\n\tsupport","Message-ID":"<20260219141253.GP520738@killaraus.ideasonboard.com>","References":"<20260216190204.106922-1-johannes.goede@oss.qualcomm.com>\n\t<85y0kr9gk9.fsf@mzamazal-thinkpadp1gen7.tpbc.csb>","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","In-Reply-To":"<85y0kr9gk9.fsf@mzamazal-thinkpadp1gen7.tpbc.csb>","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":38276,"web_url":"https://patchwork.libcamera.org/comment/38276/","msgid":"","date":"2026-02-23T15:44:46","subject":"Re: [PATCH 0/5] software_isp: debayer_cpu: Add multi-threading\n\tsupport","submitter":{"id":242,"url":"https://patchwork.libcamera.org/api/people/242/","name":"Hans de Goede","email":"johannes.goede@oss.qualcomm.com"},"content":"Hi,\n\nOn 17-Feb-26 11:00 PM, Milan Zamazal wrote:\n> Hans de Goede writes:\n> \n>> Hi All,\n>>\n>> The QCM2290 SoC used on the Arduino Uno-Q seems to have a very weak GPU(1),\n>> so weak that it is barely faster then a single CPU core.\n>>\n>> This has made me code-up the long envisioned multi-threading support\n>> for the CPU softISP :)\n> \n> Reason to not drop CPU ISP in future?\n\nOne reason yes, I think it will be good to keep it around as a lowest\ncommon denominator anyways also for e.g. phones with older powervr\ngfx which will never get FOSS GPU support and other cases where we\nmay not be able to use a GPU for one reason or another.\n\n>> Benchmark results for the Uno-Q + IMX219 running at 3280x2464 -> 3272x2464:\n>>\n>> 1 thread : 147ms / frame, ~6.5 fps\n>> 2 threads: 81ms / frame, ~12 fps\n>> 3 threads: 66ms / frame, ~14.5 fps\n>> GPU: 130ms / frame, ~7,5 fps\n>> GPU 0-copy: 110ms / frame, ~9.5 fps (requires pipeline + camss hacks)\n>> GPU lite: 85ms / frame, ~12 fps (CCM, contrast and gamma disabled)\n> \n> The CPU measurements are with or without CCM?\n\nwithout CCM.\n\nRegards,\n\nHans","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 60F9AC0DA4\n\tfor ;\n\tMon, 23 Feb 2026 15:44:54 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id A58BC62287;\n\tMon, 23 Feb 2026 16:44:53 +0100 (CET)","from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com\n\t[205.220.168.131])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 909C4621CE\n\tfor ;\n\tMon, 23 Feb 2026 16:44:51 +0100 (CET)","from pps.filterd (m0279867.ppops.net [127.0.0.1])\n\tby mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id\n\t61NAYMss3409088 for ;\n\tMon, 23 Feb 2026 15:44:50 GMT","from mail-qk1-f197.google.com (mail-qk1-f197.google.com\n\t[209.85.222.197])\n\tby mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4cgn8trvjn-1\n\t(version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT)\n\tfor ;\n\tMon, 23 Feb 2026 15:44:49 +0000 (GMT)","by mail-qk1-f197.google.com with SMTP id\n\taf79cd13be357-8c71500f274so503953085a.1\n\tfor ;\n\tMon, 23 Feb 2026 07:44:49 -0800 (PST)","from [10.40.99.10] ([78.108.130.194])\n\tby smtp.gmail.com with ESMTPSA id\n\ta640c23a62f3a-b9084e8cb3fsm341748266b.48.2026.02.23.07.44.47\n\t(version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);\n\tMon, 23 Feb 2026 07:44:47 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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