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Latency compare USB to PS/2 ports?

post #1 of 7
Thread Starter 
Mouse and keyboard lag is quite a issue for fast first person shooter games. They tend to get so fast, that my poor PC cannot compete with most, yet still I wonder, if there are tools how to measure the input lag of devices like mouse and keyboard.

For a old-school machine, I use PS/2 ports for both, yet the MX510 Logitech mouse is by original a USB device, connected only by the adapter to PS/2. That make one wonder, if the adapter could not contribute some lag on it's own... (and I think the answer is a definitive yes, it have to)

So that is why I trying to push the PS/2 ports speed up:

PS2_rate_settings.png

...but w/o being able to measure how things get faster, I have no idea if this is helping or not. Default rate is 60, witch seems to be to be awfully low...

There is a great article about it at Anadtech: AnandTech | Exploring Input Lag Inside and Out
...with many hi-fremerate videos to catch the speeds precisely, however any software tools or anything that could be used to determine the lag was not used at all.


There do exist a latency analyze tools for system devices, like this one:

latency_videoplayback.png
DPC Latency Checker

(showing example of what bad videoplayback is on JetWay V266B mobo (KT266A), because the stupid mainboard pull everything on IRQ7 - that it, on IRQ7 is - GFX card, Sound, NIC card and USB...! Even that FIVE other IRQ's are completely free: IRQ 3, 4, 5, 10 and 11 to be precise.

So, do exist something for the keyboard/mouse that could determine how difference is there between the USB and PS/2 mouse connection? Anyone have any slightest idea about this?
post #2 of 7
on the DPC latency part, i really wish people would stop using DPC latency checker, and use LatencyMon instead from http://www.resplendence.com/latencymon
It just shows so much more info, and useful info at that, not sure what the fad is about dpc latency checker, it dosent even tell you what is at fault -.-
post #3 of 7
I use both, usually LatencyMon when something is wrong and I need to find out what tongue.gif
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post #4 of 7
Thread Starter 
Axaion -
Quote:
i really wish people would stop using DPC latency checker, and use LatencyMon instead
Quote:
Because LatencyMon relies on ETW tracing it does not support any version or edition of Windows XP or Windows 2003 Server.

This is why. Using Windows 2000 SP4 and therefore I can't utilize the LatencyMon at all.

But you fail on the main question and that is - what about mouse and keyboard? How to measure them? Some tools are rather nice:

Mouse_rate_checker.png
http://www.mediafire.com/?g8g3jl06gt92l38

...but when I move mouse so slow, then the rate is also VERY slow... rolleyes.gif
post #5 of 7
Quote:
Originally Posted by trodas View Post

Axaion -

This is why. Using Windows 2000 SP4 and therefore I can't utilize the LatencyMon at all.

But you fail on the main question and that is - what about mouse and keyboard? How to measure them? Some tools are rather nice:

Mouse_rate_checker.png
http://www.mediafire.com/?g8g3jl06gt92l38

...but when I move mouse so slow, then the rate is also VERY slow... rolleyes.gif

I wasent replying to the main question at all

About the mouserate, its normal that the hertz goes down when you move the mouse slowly, thats nothing to worry about

It might be time to upgrade your OS though tongue.gif
post #6 of 7
PS2 is interrupt based rather than polling based, so while it would inherently be quicker, I would liken the people who say they can tell a difference to the people who think $10,000 speaker cables are any different sounding than decent stuff from Monoprice...
   
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post #7 of 7
Thread Starter 
Heheh... yep. But that is exactly why I much rather have some sort of independent program verification, so we can get to the bottom of what is going on wink.gif
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