LatencyMon Results Interpretation

Axymeus · November 29, 2022

Hey, hope this is the right place for this. In an effort to get rid of micro-stutters and high frame times I've tried running LatencyMon. Everything is in the green, but I'm interested in better understanding the result, specifically and generally. I'm open to any resources that could help to better frame the different numbers in terms of scale and decide if they're a non-issue or not. I wonder if they are just right under the threshold for LatencyMon to warn about, but still too high for a stable system. Here are a few questions, for the takers.

- Hard pagefaults. This is a RAM access error if I'm not mistaken? In a 10 minutes session process svchost.exe shows almost 1.5K of those, making up for more than half the total pagefaults (2.8K). I seem to recall that pagefaults are not a big issue if they are few of them, but this seems like a way too large number. Is it?

- ISRs. 466K ISRs in 10 minutes is once again looking like a giant number, especially since they are all coming from wdf01000.sys "Kernel Mode Driver Framework Runtime" with an additional 46K from HDAudBus.sys. Highest ISR execution time is a mere 144 µs so I think it's fine, but it's still a lot of interruptions on an idling system. Is this expected?

- DPCs. I am less familiar with those… They can be seen spread over a fair number of drivers with afd.sys, nvlddmkm.sys, and wdf01000.sys taking the lead, with a total of 3M. Highest execution at 380 µs. Same question as before, is this a standard behavior, should it be lower?

For the record, system is running Windows 10, fresh install, all drivers up-to-date. Hardware consists of an i7-11700K and a RTX 3070.

Thank you.

Radium_Angel · November 29, 2022

Are you getting any BSoDs?

Axymeus · November 29, 2022

None at all. The system seems to be performing adequately, except for inconsistent frame times in games, causing severe micro-stutters. At least I assume this is the source of the issue. In a 60-fps game, frame time varies from 9 to 20 ms, deviating from the target 16 ms by 30% on average. I can enable v-sync to get rid of the issue on the monitor, but the stutters remain clearly visible in any recordings where I am unable to maintain a smooth 60-fps capture, although no frames are dropped, and both CPU and GPU are at less than 10% utilization. Power settings are set to performance mode too.