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

Il 18/05/2015 18:16, Ian Jackson ha scritto:
Fabio Fantoni writes ("[PATCH v2][RFC] libxl: Add AHCI support for upstream 
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


From another mails:

see this: http://lists.xen.org/archives/html/xen-devel/2015-05/msg01277.html
  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:

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