{"action":"created","issue":{"url":"https://api.github.com/repos/notro/fbtft/issues/418","repository_url":"https://api.github.com/repos/notro/fbtft","labels_url":"https://api.github.com/repos/notro/fbtft/issues/418/labels{/name}","comments_url":"https://api.github.com/repos/notro/fbtft/issues/418/comments","events_url":"https://api.github.com/repos/notro/fbtft/issues/418/events","html_url":"https://github.com/notro/fbtft/issues/418","id":179500450,"number":418,"title":"Performance testing for more tiny TFTs","user":{"login":"gdampf","id":22430204,"avatar_url":"https://avatars.githubusercontent.com/u/22430204?v=3","gravatar_id":"","url":"https://api.github.com/users/gdampf","html_url":"https://github.com/gdampf","followers_url":"https://api.github.com/users/gdampf/followers","following_url":"https://api.github.com/users/gdampf/following{/other_user}","gists_url":"https://api.github.com/users/gdampf/gists{/gist_id}","starred_url":"https://api.github.com/users/gdampf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gdampf/subscriptions","organizations_url":"https://api.github.com/users/gdampf/orgs","repos_url":"https://api.github.com/users/gdampf/repos","events_url":"https://api.github.com/users/gdampf/events{/privacy}","received_events_url":"https://api.github.com/users/gdampf/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":9,"created_at":"2016-09-27T13:57:22Z","updated_at":"2016-11-10T12:53:10Z","closed_at":null,"body":"@notro: You published some results of performance testing one year ago.\nI am looking for other cheap but fast displays and tested waveshare35a and others.\nI am using latest kernel (4.4.22+) with a patch to correct fbtft-core.c DEBUG Messages.\nI have three questions on your work last year:\n1. I am forced to use SDL as workaround for mplayer. Do you think, the results are comparable?\n2. After the test, in dmesg, I see a wide difference between the FPS in several parts of the little movie (between 5 and 33), but stable update time (around 2300 kB/s). Would you agree, that the time between the frames is more depending on mplayer than on the TFT-Hardware?\n3. How can I detect, if DMA is available or not? I am using the overlay-file to load driver and didn't found a DMA-Parameter to pass. Is it correct, that this is enabled by default and can be switched off somehow? \n\nThank you a lot for answering this few beginners questions.\nBR\nGuido\n"},"comment":{"url":"https://api.github.com/repos/notro/fbtft/issues/comments/259682616","html_url":"https://github.com/notro/fbtft/issues/418#issuecomment-259682616","issue_url":"https://api.github.com/repos/notro/fbtft/issues/418","id":259682616,"user":{"login":"gdampf","id":22430204,"avatar_url":"https://avatars.githubusercontent.com/u/22430204?v=3","gravatar_id":"","url":"https://api.github.com/users/gdampf","html_url":"https://github.com/gdampf","followers_url":"https://api.github.com/users/gdampf/followers","following_url":"https://api.github.com/users/gdampf/following{/other_user}","gists_url":"https://api.github.com/users/gdampf/gists{/gist_id}","starred_url":"https://api.github.com/users/gdampf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gdampf/subscriptions","organizations_url":"https://api.github.com/users/gdampf/orgs","repos_url":"https://api.github.com/users/gdampf/repos","events_url":"https://api.github.com/users/gdampf/events{/privacy}","received_events_url":"https://api.github.com/users/gdampf/received_events","type":"User","site_admin":false},"created_at":"2016-11-10T12:53:10Z","updated_at":"2016-11-10T12:53:10Z","body":"Well, this sounds a bit odd for me, as the limitating factor is the transfer rate. To shorten the redraw, you need a fast display. \r\nIf the limitating factor would be the drawing (in a Buffer), you could use the fb-copy-tool to draw in fb0 (with hw-acceleration) and copy it into fb1 with that tool. But the copy itself will take time depending on the speed of the interface.\r\nSome displays have the ability to switch of backlight during this copy-process, if that helps. But I don't know, if yours has this feature.\r\nFor Frambuffer-Copy see: https://github.com/notro/fbtft/wiki/Framebuffer-use#framebuffer-mirroring"}}
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