On 05/26/2010 10:50 PM, Michael S. Tsirkin wrote: > Here's a rewrite of the original patch with a new layout. > I haven't tested it yet so no idea how this performs, but > I think this addresses the cache bounce issue raised by Avi. > Posting for early flames/comments. > > Generally, the Host end of the virtio ring doesn't need to see where > Guest is up to in consuming the ring. However, to completely understand > what's going on from the outside, this information must be exposed. > For example, host can reduce the number of interrupts by detecting > that the guest is currently handling previous buffers. > > We add a feature bit so the guest can tell the host that it's writing > out the current value there, if it wants to use that. > > This differs from original approach in that the used index > is put after avail index (they are typically written out together). > To avoid cache bounces on descriptor access, > and make future extensions easier, we put the ring itself at start of > page, and move the control after it. > I missed the spec patch, can you repost it? -- error compiling committee.c: too many arguments to function _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
