[Xen-devel] hanging dell hardware

[Daniel Schröder <sec@xxxxxxxxxxxxxxx>]

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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