{"id":26853,"date":"2025-04-26T16:33:19","date_gmt":"2025-04-26T07:33:19","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=26853"},"modified":"2025-04-26T16:33:19","modified_gmt":"2025-04-26T07:33:19","slug":"rpi3%e3%81%ae%e3%81%bb%e3%81%86%e3%81%8c%e9%81%85%e3%81%84","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=26853","title":{"rendered":"RPi3+\u306e\u307b\u3046\u304c\u9045\u3044"},"content":{"rendered":"\n

安定性については，Raspberry Pi 3 Model B (RPi3)，同 Model B+ (RPi3+)とも，<\/p>\n\n\n\n

    \n
  1. 新規にSanDisk 32GB microSDカード(SDカード)を2枚購入<\/li>\n\n\n\n
  2. 岩盤の安定度を誇るRapsberry Pi 4 Model B (RPi4)のSDカードを新しいSD2枚にそれぞれにコピー<\/li>\n\n\n\n
  3. それぞれのSDカードにsshのキーの作り直しとhost名の変更などを施す<\/li>\n\n\n\n
  4. RPi3, RPi3+にそれぞれ挿入して起動<\/li>\n<\/ol>\n\n\n\n

    という処置をとりました．これにより，RPi4までの岩盤的安定性は得られませんでしたが，1日以上は連続してRTSPを再生できるようになりました．RPi3, RPi3+はどちらもRAMが1GBしかなく，常にSWAP1<\/a><\/sup>筆者の管理するLinuxマシンは，実マシン，仮想マシン全てSWAPにはZRAMを使用しています．<\/span>を使用している状態での運用なので，4GBのRAMを持ちSWAPはほとんど使用しないRPi4とはある程度安定性に差が出ても仕方ないと思っています．<\/p>\n\n\n\n

    ということで，安定性問題はいちおう決着<\/a>です．<\/p>\n\n\n\n

    上記の手順から解るように，RPi3とRPi3+は同じロットと思われるSDカードを使用して，同じようにパーティションを切り，同じソフトをコピーしてあるのですが，にもかかわらずパフォーマンスに差が出ます．<\/p>\n\n\n\n

    なんと，RPi3+のほうが遅いのです．<\/p>\n\n\n\n

    以前から，apt update ; apt upgrade<\/code>をかけると明らかにRPi3のほうが速かったです．ただ，違う種類のSDカードを使い，ファイルの構成も違うのでそうした影響だろうと考えていました<\/p>\n\n\n\n

    しかし，現在はSDカードの性能も中身も一緒なのに，あいかわらず明らかにRPi3が速いです．特にinitramsfsを作る過程で差が出ます．<\/p>\n\n\n\n

    いつの間にかRPi3とRPi3+を取り違えてしまったかと思い，cat \/proc\/cpuinfo<\/code>やvcgencmd measure_clock arm<\/code>で確認したところ，RPi3+と思っていた方が間違いなくRPi3+でクロックも速いです．<\/p>\n\n\n

    \n
    \"\"
    RPi3+より速いRPi3<\/figcaption><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"

    \u5b89\u5b9a\u6027\u306b\u3064\u3044\u3066\u306f\uff0cRaspberry Pi 3 Model B (RPi3)\uff0c\u540c Model B+ (RPi3+)\u3068\u3082\uff0c \u3068\u3044\u3046\u51e6\u7f6e\u3092\u3068\u308a\u307e\u3057\u305f\uff0e\u3053\u308c\u306b\u3088\u308a\uff0cRPi4\u307e\u3067\u306e\u5ca9\u76e4\u7684\u5b89\u5b9a\u6027\u306f\u5f97\u3089\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u304c\uff0c1\u65e5\u4ee5\u4e0a\u306f\u9023\u7d9a\u3057\u3066RTSP\u3092\u518d\u751f\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\uff0eRPi3, RPi3+\u306f\u3069\u3061\u3089\u3082RAM\u304c1GB\u3057\u304b\u306a\u304f\uff0c\u5e38\u306bSWAP\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u72b6\u614b\u3067\u306e\u904b\u7528\u306a\u306e\u3067\uff0c4GB\u306eRAM\u3092\u6301\u3061SWAP\u306f\u307b\u3068\u3093\u3069\u4f7f\u7528\u3057\u306a\u3044RPi4\u3068\u306f\u3042\u308b\u7a0b\u5ea6\u5b89\u5b9a\u6027\u306b\u5dee\u304c\u51fa\u3066\u3082\u4ed5\u65b9\u306a\u3044\u3068\u601d\u3063\u3066\u3044\u307e\u3059\uff0e \u3068\u3044\u3046\u3053\u3068\u3067\uff0c\u5b89\u5b9a\u6027\u554f\u984c\u306f\u3044\u3061\u304a\u3046\u6c7a\u7740\u3067\u3059\uff0e \u4e0a\u8a18\u306e\u624b\u9806\u304b\u3089\u89e3\u308b\u3088\u3046\u306b\uff0cRPi3\u3068RPi3+\u306f\u540c\u3058\u30ed\u30c3\u30c8\u3068\u601d\u308f\u308c\u308bSD\u30ab\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\uff0c\u540c\u3058\u3088\u3046\u306b\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u3092\u5207\u308a\uff0c\u540c\u3058\u30bd\u30d5\u30c8\u3092\u30b3\u30d4\u30fc\u3057\u3066\u3042\u308b\u306e\u3067\u3059\u304c\uff0c\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5dee\u304c\u51fa\u307e\u3059\uff0e \u306a\u3093\u3068\uff0cRPi3+\u306e\u307b\u3046\u304c\u9045\u3044\u306e\u3067\u3059\uff0e \u4ee5\u524d\u304b\u3089\uff0capt update ; apt upgrade\u3092\u304b\u3051\u308b\u3068\u660e\u3089\u304b\u306bRPi3\u306e\u307b\u3046\u304c\u901f\u304b\u3063\u305f\u3067\u3059\uff0e\u305f\u3060\uff0c\u9055\u3046\u7a2e\u985e\u306eSD\u30ab\u30fc\u30c9\u3092\u4f7f\u3044\uff0c\u30d5\u30a1\u30a4\u30eb\u306e\u69cb\u6210\u3082\u9055\u3046\u306e\u3067\u305d\u3046\u3057\u305f\u5f71\u97ff\u3060\u308d\u3046\u3068\u8003\u3048\u3066\u3044\u307e\u3057\u305f \u3057\u304b\u3057\uff0c\u73fe\u5728\u306fSD\u30ab\u30fc\u30c9\u306e\u6027\u80fd\u3082\u4e2d\u8eab\u3082\u4e00\u7dd2\u306a\u306e\u306b\uff0c\u3042\u3044\u304b\u308f\u3089\u305a\u660e\u3089\u304b\u306bRPi3\u304c\u901f\u3044\u3067\u3059\uff0e\u7279\u306binitramsfs\u3092\u4f5c\u308b\u904e\u7a0b\u3067\u5dee\u304c\u51fa\u307e\u3059\uff0e \u3044\u3064\u306e\u9593\u306b\u304bRPi3\u3068RPi3+\u3092\u53d6\u308a\u9055\u3048\u3066\u3057\u307e\u3063\u305f\u304b\u3068\u601d\u3044\uff0ccat \/proc\/cpuinfo\u3084vcgencmd measure_clock arm\u3067\u78ba\u8a8d\u3057\u305f\u3068\u3053\u308d\uff0cRPi3+\u3068\u601d\u3063\u3066\u3044\u305f\u65b9\u304c\u9593\u9055\u3044\u306a\u304fRPi3+\u3067\u30af\u30ed\u30c3\u30af\u3082\u901f\u3044\u3067\u3059\uff0e<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_daextam_enable_autolinks":"1","footnotes":""},"categories":[27],"tags":[],"class_list":["post-26853","post","type-post","status-publish","format-standard","hentry","category-rasapberry-pi"],"publishpress_future_action":{"enabled":false,"date":"2026-05-17 09:46:35","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/26853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=26853"}],"version-history":[{"count":0,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/26853\/revisions"}],"wp:attachment":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=26853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=26853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=26853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}