Useful Tool : DPCLAT (stuttering/dropped frames)

bigj · 2007-01-07, 12:04

I came across this tool that may be useful to people with suttering/dropped frames - or for new builds as a diagnostic tool.

In short, a driver that is badly written may hog the CPU in one of its DPCs - this can starve other drivers - in a htpc that could be a cause of frame drops/stuttering.
This tool measures and graphs the peak DPC latency.

http://www.thesycon.de/deu/latency_check.shtml

Cheers,
BigJ.

surfermc · 2007-01-08, 23:19

Thanks BigJ

Great find. Really useful. Helped me narrow down my stuttering problems to a network card.

jcee · 2007-06-28, 20:26

Did it help you. I observed stutters in the similar configuration.

Mine were due to stream errors. (Some say due to bad antenna). I have lots of "VMR9helper: Playing=>Repaint" events in the log.

MPV/MPA handles this better, so I dropped PV for the time beeing.

2007-01-07, 12:04	#1 (permalink)
bigj Portal Member Join Date: Jan 2005 Posts: 238 Thanks: 5 Thanked 1 Time in 1 Post	Useful Tool : DPCLAT (stuttering/dropped frames) I came across this tool that may be useful to people with suttering/dropped frames - or for new builds as a diagnostic tool. In short, a driver that is badly written may hog the CPU in one of its DPCs - this can starve other drivers - in a htpc that could be a cause of frame drops/stuttering. This tool measures and graphs the peak DPC latency. http://www.thesycon.de/deu/latency_check.shtml Cheers, BigJ. Last edited by bigj; 2007-01-07 at 12:06. Reason: Improve title.

2007-06-28, 20:26	#3 (permalink)
jcee Portal Member Join Date: Nov 2004 Posts: 281 Thanks: 0 Thanked 1 Time in 1 Post	Did it help you. I observed stutters in the similar configuration. Mine were due to stream errors. (Some say due to bad antenna). I have lots of "VMR9helper: Playing=>Repaint" events in the log. MPV/MPA handles this better, so I dropped PV for the time beeing. __________________ 1. HTPC: FloppyDTV DVB-C + CAM/Alphacrypte, Athlon 3000+, 1GB, 160GB HDD Spinpoint, Geforce 7600GS (passive cooled), XP SP2, Pioneer PDP RXE 436, Girder RC, Thermal Balancer 2. Mac Mini + Elgato EyeTV

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2007-01-08, 23:19	#2 (permalink)
surfermc Portal Member Join Date: May 2006 Location: Dorset Posts: 271 Thanks: 15 Thanked 10 Times in 10 Posts Country: My System	Thanks BigJ Great find. Really useful. Helped me narrow down my stuttering problems to a network card.