5 Second CPU spikes with recent SVN builds (1 Viewer)

bigj

Portal Pro
January 10, 2005
245
1
See subject.

Is anyone else experiencing this?
This occured with version after the 18th May, I think with SVN <=25th May.

I'm not using dvbt epg updates. Nor is there anything in the logs to indicate any software errors/exceptions. I've also disabled powermanagement. All process plugins are disabled apart from "tv.com parser" which won't disable.

I appreciate dailybuilds come with no guarantees, but I've been tracking this bug for a couple of weeks and I should raise it if it's not already understood.

Using sysinternals processexplorer:

Every 5 seconds:
CPU usage jumps from 25% to >80% sometimes maxing out CPU with obvious results of interrupted streams.
(The extra time is spent in the kernel.)

Examining the exe, the spike corresponds to this entry point:
mscorwks.dll!CreateApplicationContext
with massive number (hundreds) of context switches.
It's hard to get timing right - but thread stack may indicate it corresponds to sql access.
(This profile has same characteristics as dvb-t epg downloads which always caused me this sort of spiking, except this is disabled)
 

bigj

Portal Pro
January 10, 2005
245
1
It's ok, I've limited this problem to one of my two tuners - leadtek 1000T.
At some point the priority system was fixed or I switched them myself, if I use my other tuner compro300 then all is fine.
Leadtek's wintv software is fine, so my current thinking is this is a problem with Leadtek's BDA driver (which is consistent with the CPU usage being kernel time). I was able to generate a stack trace with bdaplgn.ax at the top, which is the interface with the driver i believe.
Oh well, guess I have to wait for a new driver or get a new card. For the record, the compro by comparison has a consistently lower and stable cpu usage.

Anyone else got a Leadtek 1000T and is seeing this same problem?
(I'll start a new thread for this).
 

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