[{"id":36183,"web_url":"https://patchwork.libcamera.org/comment/36183/","msgid":"<176009173352.935713.18292685806781468472@ping.linuxembedded.co.uk>","date":"2025-10-10T10:22:13","subject":"Re: [PATCH v4 3/3] pipeline: simple: Initialize\n\tmaxQueuedRequestsDevice to 4","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Robert Mader (2025-10-10 10:22:26)\n> Now that the pipeline handler supports high buffer counts, apps may\n> queue more requests, exhausting e.g. frame contexts (see\n> ipa::soft::kMaxFrameContexts => 16).\n> \n> Thus limit the number of queued requests to 4, corresponding to the\n> the previous buffer limit.\n> \n> Suggested-by: Barnabás Pőcze \n> Signed-off-by: Robert Mader \n\nOddly enough - I think this series is backwards :D\n\nI think applying as \n\n3/3 Restrict pipeline queuing (to 3?) Prevent ever overflowing\n2/3 Increase buffering (to tested limits)\n1/3 Open the flood gates to let more requests be queued safely\n\nHandles this in a truely bisectable/safe way.\n\nBut that would require rewriting the commit messages and might be just\noverkill :D\n\nAnyway for this patch:\n\n\nReviewed-by: Kieran Bingham \n\n> ---\n> src/libcamera/pipeline/simple/simple.cpp | 4 +++-\n> 1 file changed, 3 insertions(+), 1 deletion(-)\n> \n> diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp\n> index c4cb7c391..dec9f6514 100644\n> --- a/src/libcamera/pipeline/simple/simple.cpp\n> +++ b/src/libcamera/pipeline/simple/simple.cpp\n> @@ -420,6 +420,7 @@ protected:\n> int queueRequestDevice(Camera *camera, Request *request) override;\n> \n> private:\n> + static constexpr unsigned int kMaxQueuedRequestsDevice = 4;\n> static constexpr unsigned int kNumInternalBuffers = 4;\n> \n> struct EntityData {\n> @@ -1287,7 +1288,8 @@ CameraConfiguration::Status SimpleCameraConfiguration::validate()\n> */\n> \n> SimplePipelineHandler::SimplePipelineHandler(CameraManager *manager)\n> - : PipelineHandler(manager), converter_(nullptr)\n> + : PipelineHandler(manager, kMaxQueuedRequestsDevice),\n> + converter_(nullptr)\n> {\n> }\n> \n> -- \n> 2.51.0\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 8CA89BE080\n\tfor ;\n\tFri, 10 Oct 2025 10:22:19 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 97CE46B60E;\n\tFri, 10 Oct 2025 12:22:18 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id A8DB16B599\n\tfor ;\n\tFri, 10 Oct 2025 12:22:16 +0200 (CEST)","from pendragon.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 45F1B2C5;\n\tFri, 10 Oct 2025 12:20:41 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","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":36194,"web_url":"https://patchwork.libcamera.org/comment/36194/","msgid":"","date":"2025-10-10T15:17:59","subject":"Re: [PATCH v4 3/3] pipeline: simple: Initialize\n\tmaxQueuedRequestsDevice to 4","submitter":{"id":140,"url":"https://patchwork.libcamera.org/api/people/140/","name":"Robert Mader","email":"robert.mader@collabora.com"},"content":"On 10/10/25 14:07, Barnabás Pőcze wrote:\n> 2025. 10. 10. 11:22 keltezéssel, Robert Mader írta:\n>> Now that the pipeline handler supports high buffer counts, apps may\n>> queue more requests, exhausting e.g. frame contexts (see\n>> ipa::soft::kMaxFrameContexts => 16).\n>>\n>> Thus limit the number of queued requests to 4, corresponding to the\n>> the previous buffer limit.\n>>\n>> Suggested-by: Barnabás Pőcze \n>> Signed-off-by: Robert Mader \n>> ---\n>\n> Tested-by: Barnabás Pőcze \n>\n> As far as I could test, this avoids the fatal assertion\n> when the number of quued buffers is > 16.\nNice, thanks!\n>\n>>   src/libcamera/pipeline/simple/simple.cpp | 4 +++-\n>>   1 file changed, 3 insertions(+), 1 deletion(-)\n>>\n>> diff --git a/src/libcamera/pipeline/simple/simple.cpp \n>> b/src/libcamera/pipeline/simple/simple.cpp\n>> index c4cb7c391..dec9f6514 100644\n>> --- a/src/libcamera/pipeline/simple/simple.cpp\n>> +++ b/src/libcamera/pipeline/simple/simple.cpp\n>> @@ -420,6 +420,7 @@ protected:\n>>       int queueRequestDevice(Camera *camera, Request *request) override;\n>>     private:\n>> +    static constexpr unsigned int kMaxQueuedRequestsDevice = 4;\n>>       static constexpr unsigned int kNumInternalBuffers = 4;\n>>         struct EntityData {\n>> @@ -1287,7 +1288,8 @@ CameraConfiguration::Status \n>> SimpleCameraConfiguration::validate()\n>>    */\n>>     SimplePipelineHandler::SimplePipelineHandler(CameraManager *manager)\n>> -    : PipelineHandler(manager), converter_(nullptr)\n>> +    : PipelineHandler(manager, kMaxQueuedRequestsDevice),\n>> +      converter_(nullptr)\n>>   {\n>>   }\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 BEAC4BE080\n\tfor ;\n\tFri, 10 Oct 2025 15:18:08 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 882716B599;\n\tFri, 10 Oct 2025 17:18:08 +0200 (CEST)","from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com\n\t[136.143.188.112])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 84F4B6B599\n\tfor ;\n\tFri, 10 Oct 2025 17:18:06 +0200 (CEST)","by mx.zohomail.com with SMTPS id 1760109482170231.97489005297416; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","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":36196,"web_url":"https://patchwork.libcamera.org/comment/36196/","msgid":"<20d3ce36-5470-49d0-9bba-02f08c55f06a@collabora.com>","date":"2025-10-10T15:20:15","subject":"Re: [PATCH v4 3/3] pipeline: simple: Initialize\n\tmaxQueuedRequestsDevice to 4","submitter":{"id":140,"url":"https://patchwork.libcamera.org/api/people/140/","name":"Robert Mader","email":"robert.mader@collabora.com"},"content":"On 10/10/25 12:22, Kieran Bingham wrote:\n> Quoting Robert Mader (2025-10-10 10:22:26)\n>> Now that the pipeline handler supports high buffer counts, apps may\n>> queue more requests, exhausting e.g. frame contexts (see\n>> ipa::soft::kMaxFrameContexts => 16).\n>>\n>> Thus limit the number of queued requests to 4, corresponding to the\n>> the previous buffer limit.\n>>\n>> Suggested-by: Barnabás Pőcze \n>> Signed-off-by: Robert Mader \n> Oddly enough - I think this series is backwards :D\n>\n> I think applying as\n>\n> 3/3 Restrict pipeline queuing (to 3?) Prevent ever overflowing\n> 2/3 Increase buffering (to tested limits)\n> 1/3 Open the flood gates to let more requests be queued safely\n>\n> Handles this in a truely bisectable/safe way.\n>\n> But that would require rewriting the commit messages and might be just\n> overkill :D\n\nI can spin a v5 over the weekend or on Monday, however feel free to \nalready land with any suggestions to the commit message :)\n\n>\n> Anyway for this patch:\n>\n>\n> Reviewed-by: Kieran Bingham \n>\n>> ---\n>> src/libcamera/pipeline/simple/simple.cpp | 4 +++-\n>> 1 file changed, 3 insertions(+), 1 deletion(-)\n>>\n>> diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp\n>> index c4cb7c391..dec9f6514 100644\n>> --- a/src/libcamera/pipeline/simple/simple.cpp\n>> +++ b/src/libcamera/pipeline/simple/simple.cpp\n>> @@ -420,6 +420,7 @@ protected:\n>> int queueRequestDevice(Camera *camera, Request *request) override;\n>> \n>> private:\n>> + static constexpr unsigned int kMaxQueuedRequestsDevice = 4;\n>> static constexpr unsigned int kNumInternalBuffers = 4;\n>> \n>> struct EntityData {\n>> @@ -1287,7 +1288,8 @@ CameraConfiguration::Status SimpleCameraConfiguration::validate()\n>> */\n>> \n>> SimplePipelineHandler::SimplePipelineHandler(CameraManager *manager)\n>> - : PipelineHandler(manager), converter_(nullptr)\n>> + : PipelineHandler(manager, kMaxQueuedRequestsDevice),\n>> + converter_(nullptr)\n>> {\n>> }\n>> \n>> -- \n>> 2.51.0\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 12164BF415\n\tfor ;\n\tFri, 10 Oct 2025 15:20:27 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id BD6E46B5C4;\n\tFri, 10 Oct 2025 17:20:26 +0200 (CEST)","from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com\n\t[136.143.188.112])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id E89076B599\n\tfor ;\n\tFri, 10 Oct 2025 17:20:23 +0200 (CEST)","by mx.zohomail.com with SMTPS id 1760109617588713.0069010121091;\n\tFri, 10 Oct 2025 08:20:17 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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