Re: [Xen-devel] Xen & I/O in clusters - problems! New Information

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> 
> We tried to compile xen0 with CONFIG_E1000_NAPI = y and got the samre 
> results between
> two xen dom0 nodes. I am not sure if these interrupts tells anything:

It's the different rate at which the eth0 interrupt counts go up
during your bandwidth tests that is interesting. e.g. poll it
once a second during the test.

It looks like your native Linux is not using legacy PIC mode
rather than using the ioapic. Have you tried an SMP native
kernel to see if it gets the same interrupt layout as Xen?
 
Ian

> Native Linux:
> 
> 
>   CPU0
>    0:   87290435          XT-PIC  timer
>    1:          2          XT-PIC  keyboard
>    2:          0          XT-PIC  cascade
>    3:    7668994          XT-PIC  eth0
>    7:          0          XT-PIC  ehci-hcd
>    8:          1          XT-PIC  rtc
>   10:          3          XT-PIC  usb-uhci
>   11:     332088          XT-PIC  aic7xxx, aic7xxx, usb-uhci
>   14:          1          XT-PIC  ide0
>   15:          0          XT-PIC  libata
> NMI:          0
> ERR:          0
> 
> 
> Xen Dom0:
> 
>            CPU0
>    1:          2        Phys-irq  keyboard
>   14:          3        Phys-irq  ide0
>   18:     954304        Phys-irq  eth0
>   24:       7313        Phys-irq  aic7xxx
>   25:         30        Phys-irq  aic7xxx
> 128:          1     Dynamic-irq  misdirect
> 129:          0     Dynamic-irq  ctrl-if
> 130:     241914     Dynamic-irq  timer
> 131:          0     Dynamic-irq  timer_dbg, net-be-dbg
> 132:          0     Dynamic-irq  console
> NMI:          0
> ERR:          0
> 
> If you can see anything which is not normal behavior of xen please
> tell us :)
> 
> Cheers,
> Rune


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