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Zebu
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Message 1 of 8

mfeavfk.sys - slow compiling

Hello,

We are experiencing very slow compiling time with ENS 10.6.1 on certain developer servers.
We have added all the necessary exclusions in OAS policy. It is tested and checked by Profiler, Procmon and Performance Analyzer. The exclusions are OK in our case.
We only see in Performance Analyzer that mfeavfk.sys driver is loaded using high percentage of CPU weight from the compiling process itself.
No high memory usage or CPU load only very long compiling time.
ENS version 10.6.1. February Update.

Any suggestion?

Thank you!

7 Replies
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chealey McAfee Employee
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Message 2 of 8

Re: mfeavfk.sys - slow compiling

Hi @Zebu 

Compilers are tricky to exclude properly because of the nature of what they do. An initial recommendation I would make, is to upgrade to the latest December 2019 Update (or wait for the Feb 2020 Update). The reason for this, is that in the October 2019 Update, we made some significant changes to the product to enhance performance. You may benefit from these changes.

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AdithyanT McAfee Employee
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Message 3 of 8

Re: mfeavfk.sys - slow compiling

Hi @Zebu,

Glad to see you active here, Good post! by the looks of it, this certainly requires more investigation via support request. However, having said that, in general, here are the recommendations:

  • Upgrade: ENS 10.6.1 February 2019 update is almost an year old. Not that we have any known issues related to this with it, but it is the general recommendation. If we discover a Bug in the product, it is only logical we work on the newest version for a fix and hence testing with the latest would be highly recommended here if that is feasible from your end.
  • Component Isolation: Have you confirmed that it is OAS that is causing the issue? disabling it helps?
  • Using Scan avoidance than exclusions: Are the processes facing the delay trusted? Unless it is something like java.exe or cscript.exe, powershell.exe, cmd.exe (you see where I am going!) if you really trust the process responsible for compilation, exclude the process by placing it under Low risk. By this way, you are essentially excluding the process activities as well from being scanned!

I sincerely hope these are of some use to your situation!

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Adithyan T
Zebu
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Message 4 of 8

Re: mfeavfk.sys - slow compiling

Hello, @AdithyanT 

Yes, I am confirming that OAS is the problem and disabling helped.
All the relevant processes are excluded and placed under Low Risk. It is check by several tools.
I will go for December Update and make some tests. Thanks for the tips! 

Zebu
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Message 5 of 8

Re: mfeavfk.sys - slow compiling

@AdithyanT ,

Can you tell me what is mfeavfk.sys? What's the purpose and function exactly?

What i know is:
MFEAVFK.SYS is a A file system filter content driver used for Anti-Virus scanning and maintaining a file cache.
Is it for scanning? Can you provide me detailed information?

Thank you!

AdithyanT McAfee Employee
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Message 6 of 8

Re: mfeavfk.sys - slow compiling

Hi @Zebu,

Good question. Unfortunately there may be some credit in not discussing about this in detail. However the expected understanding is that this is a Kernel driver that plays major role in scanning and caching results.

Apologies for the inconvenience.

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Adithyan T
Zebu
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Message 7 of 8

Re: mfeavfk.sys - slow compiling

Is the mfeavfk driver can be stopped and reloaded without computer (OS) restart?

C:\WINDOWS\system32>sc stop mfeavfk
[SC] OpenService FAILED 5:

Access is denied.

 

sysdriver.PNG

chealey McAfee Employee
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Message 8 of 8

Re: mfeavfk.sys - slow compiling

No, it can't be stopped at all because it's protected by multiple layers of Self Protection and Access Protection rules.

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