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Input lag test: msi mode vs legacy

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Input lag test: msi mode vs legacy

Postby mulz » 11 Mar 2018, 16:52

Hello, I'm a long time lurker in this website and forum, but finally decided to register in.

I have been interested about input lag in gaming for some time. I read a thread from link beneath and got interested in msi mode. I turned all my devices to msi mode one by one starting from nvidia card and got my isr/dpc latencies to drop drastically. However, I'm not so sure if the actual input lag got higher or lower in games after the switch.

http://forums.guru3d.com/threads/window ... ts.378044/

I'm asking would blurbusters team be interested in doing an input lag test comparing msi mode vs legacy? You have the skills and equipment to do this kind of stuff reliably.
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Re: Input lag test: msi mode vs legacy

Postby Sparky » 11 Mar 2018, 17:14

If you're talking about the end to end latency test setups, that's a bit of a difficult question, because DPC latency optimization is on the order of tens to hundreds of µs, and the uncertainty in the timing of inputs vs frame intervals(~1ms at 1000fps, ~17ms at 60fps) means you need hundreds to many thousands of samples in order to confidently say overall latency is better or worse by that small a quantity, or what exactly caused the difference.

Honestly, I think I'd need to take a course in statistics before attempting this measurement.
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Re: Input lag test: msi mode vs legacy

Postby sharknice » 11 Mar 2018, 18:55

I highly doubt it makes any difference at all. Unless you're getting higher fps from it.
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Re: Input lag test: msi mode vs legacy

Postby mulz » 12 Mar 2018, 02:17

sharknice wrote:I highly doubt it makes any difference at all. Unless you're getting higher fps from it.


I got about 5% fps increase atleast in one game. Hard to say. It just feels little bit different now, but I'm not sure if its different in terms of input lag or not.
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Re: Input lag test: msi mode vs legacy

Postby lexlazootin » 12 Mar 2018, 02:34

Typical gaming latency (mouse to screen) should be anywhere between 9 and 15 ms if your using a fast monitor, mouse and whatnot. I've seen hundreds of tweaks online that can "improve" your latency. So that means that users are feeling SUB ms differences in latency, or if we apply all of these latency tricks at the same time we will get -350ms latency :lol:

OR it's all bullshit and we are just fooled really easily.
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Re: Input lag test: msi mode vs legacy

Postby Chief Blur Buster » 13 Mar 2018, 15:10

It's hard to say but there are lots of snowball effects from certain tweaks -- things that makes things better and things that make things worse.

I've heard of tweaks that is supposed to improve latency but actually makes it worse. I've also heard of tweaks that improves latency supposedly by only microseconds but actually improved framerates by a benchmark-noticeable 3fps or 4fps. While many others are so insignificant that it's placebo.

Over the long term, we'll make latency tests easier allowing more obscure scenarios to be tested. See what's crapshoot and what's real -- measurable in real lag tests. But many priorities first!
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Re: Input lag test: msi mode vs legacy

Postby mulz » 15 Mar 2018, 16:18

I was also little bit sceptical about msi mode affecting input lag any significant way. When I see several people report that it helps them of course I'm still not fully convinced. Placebo can affect a lot. The tweaks might work for some PCs but not others. The thing is, more and more people start to fiddle with these settings because they read the same reports. If there was some input lag test to clearly prove that it's "snake oil", then people would not waste their time anymore in this matter.

Chief Blur Buster wrote:Over the long term, we'll make latency tests easier allowing more obscure scenarios to be tested. See what's crapshoot and what's real -- measurable in real lag tests. But many priorities first!


Sounds great! I'm eagerly waiting for all kinds of tests released about input lag in gaming. Keep up the good work!
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Re: Input lag test: msi mode vs legacy

Postby sharknice » 16 Mar 2018, 00:00

If it's actually getting you higher FPS it probably is getting lower input lag. Directly related to the FPS. For example if you just capped at the same FPS it would be the same input lag.
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