[dpdk-dev] [PATCH 5/5] virtio: fix ring size negotiation

[Ouyang, Changchun]

> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen at networkplumber.org]
> Sent: Thursday, June 11, 2015 11:53 PM
> To: Ouyang, Changchun
> Cc: dev at dpdk.org; Stephen Hemminger; Stephen Hemminger
> Subject: [PATCH 5/5] virtio: fix ring size negotiation
> 
> From: Stephen Hemminger <shemming at brocade.com>
> 
> Negotate the virtio ring size. The host may allow for very large rings but
> application may only want a smaller ring.
> Conversely, if the number of descriptors requested exceeds the virtio host
> queue size, then just silently use the smaller host size.
> 
> This fixes issues with virtio in non-QEMU envirionments.
> For example Google Compute Engine allows up to 16K elements in ring.
> 
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>

Acked-by: Changchun Ouyang<changchun.ouyang at intel.com>