On Thu, 2006-08-10 at 18:25 -0400, Xin Zhao wrote: > The inter-VM inode helps reduce communication cost used to retrieve > file attributes in a VM environment. In a network environment, it is > possible for a client to direct see the inode caches of the server. > But in the virtual server environment, where both client and server > running on the same physical host, this would be possible. > > If clients have read-only access to server's inode cache, they can > directly retrieve file attributes without incurring expensive > getattr() rpc call. Of couse the delegation is able to allow a client > to trust local cached file attributes without worry about server > change. But this only works when file is not shared by multiple > clients. Right? Does NFS4 has some other mechanisms that can further > improve performance on metadata access? Not metadata access, no. That would require some seriously messy locking rules. It improves performance by allowing a client to access the block device directly for data reads and writes if it has the capability of doing so. Trond - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
