{"id":1204,"date":"2023-05-08T03:09:28","date_gmt":"2023-05-08T03:09:28","guid":{"rendered":"http:\/\/www.recologypower.com:9080\/?p=1204"},"modified":"2023-05-08T03:09:29","modified_gmt":"2023-05-08T03:09:29","slug":"%e3%80%90linux%e3%80%91dma%e5%86%85%e5%ad%98%e5%8d%a0%e7%94%a8%e8%ae%a1%e7%ae%97","status":"publish","type":"post","link":"http:\/\/www.recologypower.com:9080\/?p=1204","title":{"rendered":"\u3010Linux\u3011DMA\u5185\u5b58\u5360\u7528\u8ba1\u7b97"},"content":{"rendered":"\n<p>1\u3001\u67e5\u770b\u5185\u5b58\u9875\u5927\u5c0f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>root@Linux:~# getconf PAGESIZE\r\n4096\r<\/code><\/pre>\n\n\n\n<p>2\u3001\u67e5\u770bDMA\u5206\u914d\u5173\u7cfb<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>root@Linux:~# cat \/proc\/buddyinfo\r\nNode 0, zone      DMA      4      5      0      5      1      3      4      4      6      7    461\r\nNode 0, zone   Normal    456   1982   1205    478    151     49     31     18     10      5   6732\r\n<\/code><\/pre>\n\n\n\n<p>3\u3001\u8ba1\u7b97DMA\u5185\u5b58\u5360\u7528\u5927\u5c0f<\/p>\n\n\n\n<p>\u6bcf\u4e00\u884c\u4ee3\u8868\u5f53\u524d\u7684\u5185\u5b58\u533a\u4e2d\u8fde\u7eed1\u30012\u30014\u30018\u300116\u300132\u300164\u3001128\u3001256\u3001512\u30011024\u4e2a\u53ef\u4f7f\u7528\u7a7a\u95f2\u9875\u7684\u6570\u91cf\uff0c\u5f53\u524d\u7cfb\u7edf\u9ed8\u8ba4\u7684\u9875\u5927\u5c0f\u4e3a4K\uff0c\u6240\u4ee5\u5206\u522b\u5bf9\u5e94\u7684\u5927\u5c0f\u4e3a1x4k\u30012x4k\u30014x4k\u30018x4k\u300116x4k\u300132x4k\u300164x4k\u3001128x4k\u3001256x4k=1M\u3001512x4k=2M\u30011024x4k=4M\uff0c\u7531\u6b64\u53ef\u4ee5\u8ba1\u7b97\u51fa\uff1a<\/p>\n\n\n\n<p>DMA\u5927\u5c0f\u4e3a\uff1a<\/p>\n\n\n\n<p>3x4M+1x2M+1x1M+\u2026=16M<\/p>\n\n\n\n<p>DMA32\u5927\u5c0f\u4e3a\uff1a<\/p>\n\n\n\n<p>539x4M+2<em>2M+2<\/em>1M+\u2026=2G<\/p>\n\n\n\n<p>Normal\u5927\u5c0f\u4e3a\uff1a<\/p>\n\n\n\n<p>7043x4M+9x2M+6x1M+\u2026=27G<\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"slide-text-bg2\">\n<h3>1\u3001\u67e5\u770b\u5185\u5b58\u9875\u5927\u5c0f 2\u3001\u67e5\u770bDMA\u5206\u914d\u5173<\/h3>\n<\/div>\n<div class=\"flex-btn-div\"><a href=\"http:\/\/www.recologypower.com:9080\/?p=1204\" class=\"btn1 flex-btn\">\u9605\u8bfb\u66f4\u591a<\/a><\/div>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[],"_links":{"self":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts\/1204"}],"collection":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1204"}],"version-history":[{"count":1,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts\/1204\/revisions"}],"predecessor-version":[{"id":1205,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts\/1204\/revisions\/1205"}],"wp:attachment":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1204"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}