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my former wrong assumption: it drains my notebook battery and I've no shortage of RAM. In Task manager you see ntoskrnl.exe is eating more CPU time than any other process. this feature does not appear to be optional and came 2 days ago with the 1st Win10 Update (Win10Pro in my case).
Edit:
I want to disable it, at least to exclude it as a culprit for my (unproven) assumptions. That process never came to my attention in the last 2 months and in task manager's long name it's called "system memory and compressed memory".
Are you sure that is the issue? If you have no shortage of RAM, the compression will not be used. And there is a separate process showing for the compression, if it is being used. – Sami Kuhmonen – 2015-11-14T11:50:44.020
It's called by that name in task manager. And being able to disable compression would help to nail – Falco Alexander – 2015-11-14T12:02:56.773
1Memory compression has been in Windows 10 since the beginning. If you have battery issues since this week it's not because of this feature. The kernel does a lot more than just memory compression. It makes all applications work on your system. – ZippyV – 2015-11-14T12:33:58.367
1What makes you think that memory compression is the problem? Have you used a detailed process analyser? If not, you should. As @ZippyV says,
ntoskrnl.exe
handles all core functions, and there are many of them, so I see no reason to single out memory compression as the culprit. – AFH – 2015-11-14T13:56:54.457let's call it intuition! as nobody seems to be able to help, I will try to profile the process. I edited the questions to fit better. – Falco Alexander – 2015-11-14T14:29:10.460
@AFH et al. you were right: I could trace it down with procexpl and perfview to be a problem with a bridge.sys driver eating much CPU in one of the ntoskrln threads. This was obviously related to my virtual switch from hyper-v. I could remove and reinstall that v-switch and CPU consumption is back to normal. Nevertheless I am still interested in knowing to disable the compression, just to know it :) – Falco Alexander – 2015-11-14T15:40:15.143
You can't. You never could. – Ramhound – 2015-11-14T15:53:33.793
Possible duplicate of Windows 10, 'System' process taking massive amounts of RAM
– magicandre1981 – 2015-11-14T19:20:44.5131this is no new feature of the update. This feature is already part of the first release, see the duplicate link. – magicandre1981 – 2015-11-14T19:22:03.893
this question is not duplicate, different focus (no memory involved), but it is/was indeed not related to update1, so I removed two words from subject. – Falco Alexander – 2015-11-14T22:26:19.673