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port-amd64/38348: Acpi become a slow system

>Number:         38348
>Category:       port-amd64
>Synopsis:       Acpi become a slow system
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 31 13:15:01 +0000 2008
>Originator:     Alexandros
>Release:        Netbsd-current
not have
NetBSD GreenApple 4.99.58 NetBSD 4.99.58 (GENERIC) #0: Sat Mar 29 02:52:34 UTC 
My machines is a DELL Inspirion 1721

Cpu amd64 dual core thurion TL66
More description:

Kernel is a Generic but ditto compiled kernel with acpi present always same 

The system beacome very slow in many operation, for kernel pause very often 
when load driver, for script after kernel sleep in some service example: 
Aliases in nework

after boot various service before give a login prompt sleep 4 second, after 
login sleep 5 second and give a terminal

top or ping show output after 5 second or more

i try this:

date && sleep 1 && date

Mon Mar 31 13:30:00 CEST 2008
Mon Mar 31 13:30:05 CEST 2008

in the end when reboot machines the shell output who have reboot and date, 
sleep one minute or more and output sync disk and reboot machines...
not know
boot -c /netbsd

>disable acpi0

and machine work correctly

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