Hi *,
there are numerous mails about this xen "problem".
A short abstract:
On Dell PowerEdge 28XX the system freezes or locks on IO if USB is
enabled in Bios.
The reason behind this, is a shared irq problem, because USB and NIC
shares in Bios same IRQ e.g. both 15 or 7.
Bios shares some other irqs too but these seems to be not a problem...
This problem occures only with XEN Kernel dom0, a "normal" distri kernel
works fine...
If USB is in bios disabled...all is fine...
this is a /proc/interrupts with USB enabled
 CPU0
 1: 141 Phys-irq i8042
 12: 93 Phys-irq i8042
 16: 161 Phys-irq uhci_hcd
 18: 3917 Phys-irq uhci_hcd
 19: 0 Phys-irq uhci_hcd
 23: 27 Phys-irq ehci_hcd
 38: 2940 Phys-irq megaraid
 58: 80 Phys-irq aic7xxx
 59: 30 Phys-irq aic7xxx
 72: 31 Phys-irq eth0
128: 1 Dynamic-irq misdirect
129: 0 Dynamic-irq ctrl-if
130: 9832 Dynamic-irq timer
131: 0 Dynamic-irq console
132: 0 Dynamic-irq net-be-dbg
NMI: 0
ERR: 0
and this with usb disabled
 CPU0
 1: 8 Phys-irq i8042
 12: 93 Phys-irq i8042
 14: 264 Phys-irq ide0
 16: 357354 Phys-irq uhci_hcd
 38: 25038 Phys-irq megaraid
 58: 80 Phys-irq aic7xxx
 59: 30 Phys-irq aic7xxx
 72: 212147 Phys-irq eth0
128: 1 Dynamic-irq misdirect
129: 0 Dynamic-irq ctrl-if
130: 54174 Dynamic-irq timer
131: 0 Dynamic-irq console
132: 0 Dynamic-irq net-be-dbg
NMI: 0
ERR: 0
This problem is very annoying to me...because i am using an usb
usv...and at the moment i must disable USB in bios to have a stable machine!
Plz. could some developer contact me to investigate and fix this
problem? Or is this problem known and fixed in a newer version?
Currently i am using Xen 2.06 with xen Kernel 2.6.11.10 32bit
cheers,
daniel
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