php - apache 2.2 to 2.4 sporadic performance drop -

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i updated apache 2.2 2.4 , php 5.3 5.4. reason experiencing huge performance drops in around 5% of requests server. on average, sites load in less 2 seconds in 5% of cases takes anywhere between 30 60 seconds of spinning before site loads.

i copied old prefork settings

startservers       8 minspareservers    5 maxspareservers   10 serverlimit      512 maxclients       512 maxrequestsperchild  4000:

setup: 8 vcpu, 8gb ram, ssd cpu never goes on 30%, ram stays @ around 1.8gb.

db on separate server , performs fast. debugged , never got slow query (nothing on minute).

i performed 2.2 2.4 update steps here http://httpd.apache.org/docs/trunk/upgrading.html didnt help. there other way debug server , why slows down badly? not suspect php reason since codebase did not change.

edit

i need add when page spnning, can click on link, press enter , there big chnage load in under 2 seconds. have hit enter or refresh loading page 2 or 3 times , loads immediately.


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