Author: rmacklem Date: Mon Jul 3 20:12:31 2017 New Revision: 320617 URL: https://svnweb.freebsd.org/changeset/base/320617
Log: MFC: r319882 Define NFS_MAXXDR as the upper bound on XDR overhead in an NFS RPC. This definition is a part of the maxiotune2 patch that will be committed soon. Modified: stable/10/sys/fs/nfs/nfsproto.h Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/fs/nfs/nfsproto.h ============================================================================== --- stable/10/sys/fs/nfs/nfsproto.h Mon Jul 3 19:49:25 2017 (r320616) +++ stable/10/sys/fs/nfs/nfsproto.h Mon Jul 3 20:12:31 2017 (r320617) @@ -56,8 +56,22 @@ #define NFS_MAXDGRAMDATA 16384 #define NFS_MAXPATHLEN 1024 #define NFS_MAXNAMLEN 255 +/* + * Calculating the maximum XDR overhead for an NFS RPC isn't easy. + * NFS_MAXPKTHDR is antiquated and assumes AUTH_SYS over UDP. + * NFS_MAXXDR should be sufficient for all NFS versions over TCP. + * It includes: + * - Maximum RPC message header. It can include 2 400byte authenticators plus + * a machine name of unlimited length, although it is usually relatively + * small. + * - XDR overheads for the NFSv4 compound. This can include Owner and + * Owner_group strings, which are usually fairly small, but are allowed + * to be up to 1024 bytes each. + * 4096 is overkill, but should always be sufficient. + */ #define NFS_MAXPKTHDR 404 -#define NFS_MAXPACKET (NFS_SRVMAXIO + 2048) +#define NFS_MAXXDR 4096 +#define NFS_MAXPACKET (NFS_SRVMAXIO + NFS_MAXXDR) #define NFS_MINPACKET 20 #define NFS_FABLKSIZE 512 /* Size in bytes of a block wrt fa_blocks */ #define NFSV4_MINORVERSION 0 /* V4 Minor version */ _______________________________________________ svn-src-stable-10@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-stable-10 To unsubscribe, send any mail to "svn-src-stable-10-unsubscr...@freebsd.org"
