Newsdee wrote:So... this means the USB handling of MiSTer is perfectly fine and not a source of input lag?
Good job on the comparison!
vanfanel wrote:On the Pi tests, was max_swapchain=2 used on the RetroArch config? If you use max_swapchain=3 (default) you will get at least one additional frame of input lag.
Also, usbhid.jspoll=2 should be passed to the kernel on cmdline.txt.
That or the tests are not valid, I think.
oskarzer0 wrote:Other video:
MiSTer with simultaneous out HDMI and Scart at left, Megadrive Scart at right, video to 60HZ
oskarzer0 wrote:(Response Time: 2ms (GTG))
oskarzer0 wrote:But the frame diference in MiSTer with simultaneous out HDMI and Scart is because the hdmi monitor have lag, no?
oskarzer0 wrote:Look in attachment, in the original system and in Mister for Scart, Sonic is blue ball and in the led (MiSTer simultaneous HDMI) not yet (1 frame - 2 frame lag)
Locutus73 wrote:Maybe if you set vga_scaler=1 in MiSTer.ini you can have a good measure of how is laggy your HDTV compared to a CRT, but Sorgelig should confirm this hypothesis.
Sorgelig wrote:this is human's lag:
https://www.humanbenchmark.com/tests/re ... statistics
so, before talk about 1-2 frames lag, fix your own lag first
I think this discussion can be closed already.
the whole discussion is pointless, as real meaning of this discussion is when you already know when you have to react. For example you see moving enemy and you predict the time of collision. But if you don't know when to react, the whole human reaction lag is added which is around 250-300ms.
But you don't take in account of brain automatic training, so predictable reaction is reduced by brain after couple tries. Input controller lag, scaler lag and even human lag - all this is eliminated by brain after short time of play, so you even won't notice it.
paulbnl wrote:The brain only tricks you into perceiving less input lag then there really is. The real reaction time is still longer with higher input lag and games which needs short reaction time like Punch Out will be much more difficult.
paulbnl wrote:Everyone that plays retro games knows that low input lag is needed.
Sorgelig wrote:oskarzer0 wrote:Look in attachment, in the original system and in Mister for Scart, Sonic is blue ball and in the led (MiSTer simultaneous HDMI) not yet (1 frame - 2 frame lag)
sure. scaler uses tripple buffering to make sure playback is smooth. So, HDMI has 1-2 frames lag. Otherwise it will have tearing.Locutus73 wrote:Maybe if you set vga_scaler=1 in MiSTer.ini you can have a good measure of how is laggy your HDTV compared to a CRT, but Sorgelig should confirm this hypothesis.
yes, it will output the same HDMI video through VGA output, so you can measure the lag of TV itself.
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