etm trace on stm32f429

hi i need to use 4pins etm trace on stm32f429 but i have this problems:

1- i cant trace when core clock is more than 100 mhz?

2-if i chose core clock to 100 mhz and run program for a few seconde( like 3s) i have a large value of times on performance analayzer windows. (like 4075.25s on init function) !!!?

i use ulink pro and mdk arm 5
thanks
best regards

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