[Xen-devel] Re: 1850/2850 hangs under I/O load

[David H <davidh.davidh@xxxxxxxxx>]

I have some supermicro systems with the same chipset/problem as the
1850/2850.  This patch appears to fix the problem for me.  I could
always hang the server by using scp to copy a large file.  I have been
able to scp this file 10 times without a hang!!  However, it looks
like we lose ACPI.  Is that the expected outcome?

cat /proc/interrups before and after:
          CPU0
 1:         10        Phys-irq  i8042
 9:          0        Phys-irq  acpi
 12:        101        Phys-irq  i8042
 15:    4412096        Phys-irq  ide1
 16:      94555        Phys-irq  uhci_hcd, uhci_hcd
 18:    6161124        Phys-irq  uhci_hcd
 19:          0        Phys-irq  uhci_hcd
 48:      84003        Phys-irq  3w-xxxx
 54:    3091939        Phys-irq  eth0
256:          0     Dynamic-irq  ctrl-if
257:   22704931     Dynamic-irq  timer0
258:          0     Dynamic-irq  console
259:          0     Dynamic-irq  net-be-dbg
NMI:          0
LOC:          0
ERR:          0
MIS:          0

          CPU0
 1:         10        Phys-irq  i8042
 12:        101        Phys-irq  i8042
 15:      24398        Phys-irq  ide1
 16:     288202        Phys-irq  uhci_hcd, uhci_hcd
 18:    7522500        Phys-irq  uhci_hcd
 19:          0        Phys-irq  uhci_hcd
 48:      92704        Phys-irq  3w-xxxx
 54:    7764230        Phys-irq  eth0
128:          1     Dynamic-irq  misdirect
129:          0     Dynamic-irq  ctrl-if
130:     239113     Dynamic-irq  timer
131:          0     Dynamic-irq  console
132:          0     Dynamic-irq  net-be-dbg
NMI:          0
ERR:          0

David



On 7/13/05, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> 
> Looking back over the emails on this topic, someone pointed out a
> patch for Linux 2.6.10 that disabled software IRQ affinity for
> 1850/2850 systems.
> 
> You can try a similar fix on Xen (either 2.0.x or unstable) by editing
> arch/x86/irq.c:pirq_guest_bind(), and remove the following lines:
> 
>     if ( desc->handler->set_affinity != NULL )
>         desc->handler->set_affinity(<blah>);
> 
> If this fixes the I/O hangs for you, it is a nicer fix than
> ignorebiostables. I can add a boot parameter to have the same effect,
> and also probably have the fix applied automatically for 1850/2850
> systems in the unstable tree (just like Linux).
> 
> Let me know how it works out.
> 
>  -- Keir
>

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