Re: [Xen-devel] [PATCH v2][RFC] libxl: Add AHCI support for upstream qemu

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 18/05/2015 18:16, Ian Jackson ha scritto:
> Fabio Fantoni writes ("[PATCH v2][RFC] libxl: Add AHCI support for upstream 
> qemu"):
> > If enabled adds ich9 disk controller in ahci mode and uses it with
> > upstream qemu to emulate disks instead of ide.
> I'm sorry for perhaps querying the obvious, but why is this a good
> idea ?  I think the underlying motivation should be explained in the
> commit message.
>
> That will also help us understand whether we ought to be changing the
> default.
>
> Ian.
From another mails:

see this: http://lists.xen.org/archives/html/xen-devel/2015-05/msg01277.html
and...
> >   Do you notice improvement using
> > AHCI when booting a guest?
> The more significant is with lubuntu 15.04 hvm where time boot time to 
> login is only about a fifth!!! (20%) in comparison to without.
> With windows 7 pro 64 bit is different in many case, in better case 
> the boot time is about a third (33%), in the worst it seems to gain 
> only 10-20% of the total time.
> With windows 8.1 the gain is only 5-10% of the total but with win8 the 
> boot time is very long in any case, I don't know if caused by 
> unexpected case in xen or windows 8 is simply bad or weighty. 
And another details probably useful:
http://lists.xen.org/archives/html/xen-devel/2015-05/msg02327.html

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