NetOS 6.0, high jitter and disabling IRPs?

With NetOS 4.0/5.0 I have a very high jitter in executing irp routines. The reason is, that the ethernet routines disable all irps for a certain amount of time, even if my irp is on a higher level. Has this been changed in NetOS 6.0?

There is a define for the Ethernet driver that causes it to leave interrupts enabled while it is enqueue transmit packets. ETH_DISABLE_INTS_DURING_TRANSMIT