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by entropy47 114 days ago
I don't know how scientifically valid this is (I hope very) but when a friend told me my USB hub / switcher would be introducing a lot of input lag, I bought a USB to eth adaptor and did a few thousand pings to the router, from direct to mobo and then from via the switcher. Unsurprisingly, there was no measurable latency (I had to use a 3P tool because Windows wouldn't go lower than ms by default).

I am aware that admitting to using Windows in these hallowed halls is a terrible sin, but the anecdote was too relevant to pass up and that's an important detail for anybody looking to repro.
1 comments
dietr1ch 114 days ago
So, the complaints against USB coming from PS/2 were around the switch from pushing inputs to polling with a relatively low rate on vastly slower CPUs. Nowadays CPUs are much faster and parallel; and the polling rates are in the 1-8 kHz as opposed to 100-400Hz.

I don't see any pro gamers carrying in any kind of PS/2 device, they even moved to wireless so the differences are likely meaningless these days.

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dietr1ch 114 days ago
And I completely missed on all the optimisations that have been going into the USB and scheduling stacks.
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