Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device

[Gleb Natapov]

On Mon, Jul 19, 2010 at 02:06:27PM +0100, Richard W.M. Jones wrote:
> On Mon, Jul 19, 2010 at 12:15:43PM +0300, Gleb Natapov wrote:
> > That what we are talking about, no? We are trying to find faster way to
> > load kernel/initrd and stay architectural. Honestly I would expect much
> > greater speedup from Richard's approach like 2 seconds vs 8 seconds. It
> > is hard to justify code complication just for 1 second speedup.
> 
> I've no idea where this "8 seconds" comes from.  Total boot time
That was number generated by may random number generator. I was just
trying to say that I would have expected much more gain from copying
kernel/initrd directly into the memory considering how much is going
on during pio string emulation.

> currently is < 8 seconds even without my patch.  My patch takes it
> from 7.5 seconds to 6.5 seconds.
> 
It shows that we are not so bad at emulating pio string operations.

--
                        Gleb.