On 12/05/15 11:58, Bob Liu wrote:
> After commit 1b1586eeeb8c ("xenbus_client: Extend interface to
> support multi-page ring"), Linux xenbus driver can support multi-page ring.
>
> Based on this interface, we got some impressive improvements by using
> multi-page
> ring in xen-block driver. If using 64 pages as the ring, the IOPS increased
> about 15 times for the throughput testing.
>
> The Linux implementation reuses two 'DEPRECATED' nodes('max-ring-pages' and
> 'num-ring-pages), so that nothing would be broken.
> Also removed the power of 2 limit and updated the default/max value
> accordingly.
You can't drop the power of 2 restriction as there may be frontends that
support this old option (from before it was deprecated) and these may
not support non-powers of 2.
David
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