Re: [Xen-users] Xen linux and gaming box

[Karim Sanjabi <karim@xxxxxxxxxxxxxxxxx>]

Does it makes sense (or can it be done) to pass through a sata bus with the ssd on it? 

Karim

On Fri, Sep 28, 2012 at 9:38 PM, James Harper <james.harper@xxxxxxxxxxxxxxxx> wrote:

>
> Windows recognizes the drive as an SSD, since it turned off defrag
> automatically for just that drive.  I don't know if GPLPV has anything to do
> with it, if it turned off defrag maybe it's Windows/NTFS taking care of TRIM?
>

Windows can't possibly know that the drive is an SSD unless I've told it, and GPLPV doesn't give it any such information. That's for vbd (eg regular block device) though. For a USB disk passed through, or a scsi passthrough device it could interrogate the drive directly.

> There are a lot of factors involved, remember it is running on a Logical
> Volume partition which is handled by LVM, so it's not all about the drivers.
>

As far as GPLPV is concerned, the communications channel is basically read and write. Very little meta-information is passed through. I haven't even added barrier support yet because I've only recently been using a system that provides it for LVM.

James

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