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RE: [Xen-devel] Interrupt Coalescence

To: "Hevard Bjerke" <havarbj@xxxxxxxxxxx>
Subject: RE: [Xen-devel] Interrupt Coalescence
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Sat, 13 Nov 2004 21:24:10 -0000
Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
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Thread-index: AcTIpww3CZhtrkNlTvO6nKXn2iRhZgBHv+/w
Thread-topic: [Xen-devel] Interrupt Coalescence
> > What happenes if you boot with 'igrnorebiostables' on the 
> Xen command line (this forces uniprocessor)?  This will use 
> the legacy PIC rather than the IOAPIC.
> >  
> I've already found that 'ignorebiostables' solves the IOAPIC 
> problem, giving equal performance in native and dom0.
> Whether with or without 'ignorebiostables', disabling IC 
> leads to dramatically reduced bandwidth in dom0 but not in native.

I'm rather more interested in getting the IOAPIC working on your
platform than figuring out what's going on with the legacy PIC. Can you
say a bit about the CPU and chipset you're using? 

Since it looks like there's a nasty interrupt problem on your system,
it's perhaps not surprising that disabling interrupt coallescing causes
problems. My guess is that you end up doing some nasty spinning iwithin

Could you get a serial line on the system to enable you to readout the
Xen s/w performance counters? (hit 'p' to print, 'P' to reset) 


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