[Warning] Bootcamp 5 may cause system slowdown and crash !!

I found out that my maxed iMac 2013 is running OK but experiencing hiccups or slowdowns sometimes. I could monitor the latency, DPC count and ISR and tried to clean boot, uninstall everything from scratch but nop, nothing helped.

Outlook 2013 was taking 5 seconds to load, other applications were OK.

I then had one BSOD with crash minidump. After analyzing the output, it turned out to be a driver causing excessive memory paging. The only solution was to test the system with Driver Verifier. It turned out to be KeyAgent.sys from Apple. I renamed this file and my system is blazing fast again. Outlook takes less than a second to load. No more hiccups. Worth mentioning that the volumeUp/Down shortcuts are not working and Bootcamp manager is not working anymore but that's fine.

Now my latency is way below 400us :

PER CPU MEASURINGS
_________________________________________________________________________________________________________
Highest latency on CPU 0: 34.60314 µs
Highest latency on CPU 1: 60.11563 µs
Highest latency on CPU 2: 31.67067 µs
Highest latency on CPU 3: 35.77613 µs
Highest latency on CPU 4: 31.96392 µs
Highest latency on CPU 5: 32.25717 µs
Highest latency on CPU 6: 42.66604 µs
Highest latency on CPU 7: 57.76965 µs


_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name: IMAC-IA64
OS version: Windows 8 , 6.2, build: 9200Highest latency on CPU 7: 57.76965 µs
Hardware: iMac14,2, Apple Inc., Mac-27ADBB7B4CExxxx1
CPU: GenuineIntel Intel(R) Core(TM) i7-4771 CPU @ 3.90GHz
Logical processors: 8
Processor groups: 1
RAM: 32708 MB total


=================================


You can test it yourself :

How to enable Driver Verifier:

Start > type "verifier" without the quotes > Select the following options -

1. Select - "Create custom settings (for code developers)"
2. Select - "Select individual settings from a full list"
3. Check the following boxes -
- Special Pool
- Pool Tracking
- Force IRQL Checking
- Deadlock Detection
- Security Checks (Windows 7 & 8)
- DDI compliance checking (Windows 8)
- Miscellaneous Checks
4. Select - "Select driver names from a list"
5. Click on the "Provider" tab. This will sort all of the drivers by the provider.
6. Check EVERY box that is NOT provided by Microsoft / Microsoft Corporation.
7. Click on Finish.
8. Restart.

Important information regarding Driver Verifier:

- If Driver Verifier finds a violation, the system will BSOD.

- After enabling Driver Verifier and restarting the system, depending on the culprit, if for example the driver is on start-up, you may not be able to get back into normal Windows because Driver Verifier will flag it, and as stated above, that will cause / force a BSOD.

If this happens, do not panic, do the following:

- Boot into Safe Mode by repeatedly tapping the F8 key during boot-up.

- Once in Safe Mode - Start > type "system restore" without the quotes.

- Choose the restore point you created earlier.
If you did not set up a restore point, do not worry, you can still disable Driver Verifier to get back into normal Windows:

- Start > Search > type "cmd" without the quotes.

- To turn off Driver Verifier, type in cmd "verifier /reset" without the quotes.
・ Restart and boot into normal Windows.


Cheers...

 

I tried both. One downloaded from Apple website 5033 and another one 52xx using BCA. I am very positive about this bug and I simulated it on another bootcamp machine with Windows 8.1

You need to run Driver Verifier from Microsoft to confirm it.

 

I also removed the AppleHFS and AppleMNT drivers installed with bootcamp.

They cause some lockups infrequently and too much ISR, and I mean too much.

I removed both files and services ( sc del applemnt | sc del applehfs ) and my interrupt latency is down to 20-50 microsecond now.

I installed MacDrive and it's handline HFS+ much better. Tags and thumbnails are generated on an external drive now and all is good.

*** ERROR: Module load completed but symbols could not be loaded for AppleMNT.sys
Probably caused by : AppleMNT.sys ( AppleMNT+5dc )
BUGCHECK_STR: 0x8E


*** ERROR: Module load completed but symbols could not be loaded for AppleMNT.sys
Probably caused by : AppleMNT.sys ( AppleMNT+5dc )
BUGCHECK_STR: 0x8E
PROCESS_NAME: notepad.exe
FAILURE_BUCKET_ID: 0x8E_AppleMNT+5dc
Bugcheck code 1000008E



Warning : ParagonHFS will reinstall those two drivers so don't install it. Even the version 10 caused me too much headache. I'll probably purchase the MacDrive 9xx. Version 8 of MacDrive did corrupt my external drive partition but this one seems to be stable.




So far that's how my latency looks like with 10.9 GB in use ( 40 opened tabs in Chrome, playing Flac audio, office and Lync 2013 in background and 109 processes started )





Current measured interrupt was always above 300 and the highest Interrupt/ ISR and DPC were always above 600.

OS is much smoother. No hiccups whatsoever.

 

I have AppleMNT 5.0 but AppleHFS is still 4.1

Bootcamp 5 built 5270. I can't find version 5510 anywhere and BCP won't download version above 5270

 

Ok nice but what to do ? I'm stuck with this old version ?



Edit :

Would you also please check the Thunderbolt driver version ? mine gives me a lot of headache