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I've been noticing the cpu usage go up, back down for a couple minutes, and then go up again, and vice-versa...

Not constant but it happened several times. (almost always up to 23% cpu constant when it happens)

This happened just now only with firefox interaction, got skype and LoLClient running too..

Looking at it in Process Explorer, i see two files taking approximately 10% each:

ntoskrnl.exe dxgmms1.sys

The problem is after looking up that dxmgmms1.sys i found that it stands for "Microsoft DirectX Graphics MMS system driver file." and i can't remember updating it at all. The other one i believe it's what's enabling or something since it's kinda part of the Windows kernel?

I've done sfc couple months ago when i first noticed this, runned malware scans, windows always up-to-date and everything.

How can i fix this?

Edit: It happened again, i done a xperf scan as suggested:

xperf -on latency -stackwalk profile -buffersize 1024 -MaxFile 512 -FileMode Circular && timeout -1 && xperf -d highCPUUsage.etl

I uploaded the file to my dropbox, can someone tell analyze it or something? Or should i post on the msdn forums?

https://dl.dropboxusercontent.com/u/36066558/highCPUUsage.7z

Thanks to whoever helps, hope i recorded it correctly, it displayed a warning when i started the trace.

SomeNickName
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1 Answers1

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Following @magicandre1981 advice, i'll post my "solution".

The culprit was the driver for my Intel HD5400 card, i noticed every time i opened a stream on livecoding.tv (can't remember if it had the same problem on twitch for example) my CPU would spyke to 30-35%, upon closer look, i saw firefox was eating 12-15% and SYSTEM process was eating another 15% just for the stream alone.

Since it was a laptop and it had two cards on Sandy Bridge, i began to ran firefox and basically every other program as the nvidia card (gt650m) since it was better anyway, in this case the SYSTEM cpu stayed at ~0% and firefox cpu stayed at 3-5%, which was a 25% cpu overall reduction.

I don't know if the driver ever got fixed, i just use the nvidia card.

SomeNickName
  • 330