Il 07/02/2013 14:31, Michael S. Tsirkin ha scritto: > > Single means *this piece* (for example a request header) is single. It > > could still end up in an indirect buffer because QEMU does not support > > mixed direct/indirect buffers. > > Yes but why is the optimization worth it? > It makes sense if all we want to do is add a single buffer > in one go, this would give us virtqueue_add_buf_single. > > But if we are building up an s/g list anyway, > speeding up one of the entries a tiny bit > seems very unlikely to be measureable. > No? There is some optimization potential even in unrolling the loop, but yes, it looks like I misunderstood. I'll add virtqueue_add_buf_single instead. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
