DL160g5p strange problem with the system console

[Vyacheslav Druzhinin]

Hi,

I've tried to install various releases 7.0, 7.1, 7-STABLE and 8-HEAD on the
8-core server (dual Xeon) with the same effect. I can't get what is going on
with the system console. Changing to the second console by pressing Alt+F2
takes lag about two or three seconds  on 100 idle system.  If I starting to
press Alt+F1 and Alt+F2 rapidly, as fast as I can, the load of the system
grows up incredibly. 

# top -SH

last pid:   945;  load averages:  1.95,  0.55,  0.20                                           
up 0+00:52:22  09:33:44
84 processes:  10 running, 56 sleeping, 18 waiting
CPU:  0.0% user,  0.0% nice,  0.0% system, 43.2% interrupt, 56.8% idle
Mem: 15M Active, 7744K Inact, 95M Wired, 28K Cache, 11M Buf, 7810M Free
Swap: 8192M Total, 8192M Free

[...]

23 root     -24    -     0K    16K WAIT   3   1:57 100.00% swi6: Giant taskq
19 root     -32    -     0K    16K WAIT   2   1:55 100.00% swi4: clock sio
34 root     -64    -     0K    16K WAIT   1   1:55 100.00% irq23: uhci0
ehci0
   
What does it mean? Why switching betwen system consoles take lag? Why it
loads a system? 
Also I've tried to compile kernel without it:

device          uhci            # UHCI PCI->USB interface
device          ohci            # OHCI PCI->USB interface
device          ehci            # EHCI PCI->USB interface (USB 2.0)

but the PS/2 keyboard become unworked. Why the usb subsystem interacts with
the PS/2 keyboard?

And after that I've tried Fedora 9, it runs without any lags in system
console.

Please, can anybody help me with this lags? I thought if it lags something
going wrong with the system.

Any help would be appreciated.

WBR,
Vyacheslav.
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