On 01/08/2010 05:40 PM, Christoph Hellwig wrote:
Maybe we should pick one on image creation and then stick to it. For an
image format we could write down this information in the image, but for
a raw images that's impossible.
The management system should remember it (like it remembers which
On Tue, Jan 05, 2010 at 08:16:15PM +, Jamie Lokier wrote:
> It would be good if virtio relayed the backing device's basic topology
> hints, so:
>
> - If the backing dev is a real disk with 512-byte sectors,
> virtio should indicate 512-byte blocks to the guest.
>
> - If the back
Avi Kivity wrote:
> Physical block size is the what the logical block size would have been
> is software didn't suck. In theory they should be the same, but since
> compatibility reaons clamp the logical block size to 512, they have to
> differ. A disk may have a physical block size of 4096 an
Avi Kivity wrote:
> On 01/05/2010 02:56 PM, Rusty Russell wrote:
> >
> >>Those should be the same for any sane interface. They are for classical
> >>disk devices with larger block sizes (MO, s390 dasd) and also for the
> >>now appearing 4k sector scsi disks. But in the ide world people are
> >>co
On 01/05/2010 02:56 PM, Rusty Russell wrote:
Those should be the same for any sane interface. They are for classical
disk devices with larger block sizes (MO, s390 dasd) and also for the
now appearing 4k sector scsi disks. But in the ide world people are
concerned about dos/window legacy comp
On Mon, 4 Jan 2010 07:00:35 pm Christoph Hellwig wrote:
> On Mon, Jan 04, 2010 at 01:38:51PM +1030, Rusty Russell wrote:
> > I thought this was what I was doing, but I have shown over and over that
> > I have no idea about block devices.
> >
> > Our current driver treats BLK_SIZE as the logical an
On Mon, Jan 04, 2010 at 01:38:51PM +1030, Rusty Russell wrote:
> I thought this was what I was doing, but I have shown over and over that
> I have no idea about block devices.
>
> Our current driver treats BLK_SIZE as the logical and physical size (see
> blk_queue_logical_block_size).
>
> I have
On 01/04/2010 05:08 AM, Rusty Russell wrote:
On Tue, 29 Dec 2009 03:09:23 am Avi Kivity wrote:
This patch adds a physical block size attribute to virtio disks,
corresponding to /sys/devices/.../physical_block_size. It is defined as
the request alignment which will not trigger RMW cycles. T
On Tue, 29 Dec 2009 03:09:23 am Avi Kivity wrote:
> This patch adds a physical block size attribute to virtio disks,
> corresponding to /sys/devices/.../physical_block_size. It is defined as
> the request alignment which will not trigger RMW cycles. This can be
> important for modern disks which
