Re: [Xen-devel] [PATCH 2/2] drivers: xen/block: add multi-page ring support

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

El 23/01/15 a les 10.14, Bob Liu ha escrit:
> Extend xen/block to support multi-page ring.
>  * xen-blkback notify blkfront with feature-multi-ring-pages
>  * xen-blkfront write to xenstore about how many pages are used as the ring
> 
> If using 4 pages as the ring, inflight requests inscreased from 32 to 128 and
> IOPS improved nearly 400% on our system.
> 
> Signed-off-by: Bob Liu <bob.liu@xxxxxxxxxx>
> ---
>  drivers/block/xen-blkback/xenbus.c |   86 +++++++++++++++++++++++++--------
>  drivers/block/xen-blkfront.c       |   94 
> ++++++++++++++++++++++++++----------

This requires a patch to xen/include/public/io/blkif.h in the Xen
repository describing how this protocol extension is going to work
before reviewing the Linux implementation.

Roger.


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