Re: [Xen-devel] [Qemu-devel] [PATCH v3 6/6] qemu_calculate_timeout: increase minimum timeout to 1h

[Paul Brook <paul@xxxxxxxxxxxxxxxx>]

> On 02/10/2012 01:26 AM, Paul Brook wrote:
> > The reason we have this is because there are bits of code that rely on
> > polling.  IIRC slirp and the floppy DMA engine were the main culprits.
> > qemu_calculate_timeout is an ugly hack to poll at least once a second,
> > allowing the guest to make forward progress when we miss an event.
> 
> At least the floppy DMA engine is fine with it, it uses idle bottom
> halves (which are a hack and could be replaced by timers, but that's not
> relevant now).

I thought idle bottom halves were one of the things that made this timout 
necessary.  How else are they going to get run?

Paul

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