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| author | rmacklem <rmacklem@FreeBSD.org> | 2015-04-30 12:44:20 +0000 |
|---|---|---|
| committer | rmacklem <rmacklem@FreeBSD.org> | 2015-04-30 12:44:20 +0000 |
| commit | de0424ce2628044461b3970c30ea52cd23d4a937 (patch) | |
| tree | f41eba473f204c65db3fdb1264d7d97013acb15f /sys/fs/nfs/nfsproto.h | |
| parent | fba63dddeb47d7daf52036b191fc27d0b34cb02b (diff) | |
| download | FreeBSD-src-de0424ce2628044461b3970c30ea52cd23d4a937.zip FreeBSD-src-de0424ce2628044461b3970c30ea52cd23d4a937.tar.gz | |
MFC: r281628
mav@ has found that NFS servers exporting ZFS file systems
can perform better when using a 128K read/write data size.
This patch changes NFS_MAXDATA from 64K to 128K so that
clients can use 128K for NFS mounts to allow this.
The patch also renames NFS_MAXDATA to NFS_SRVMAXIO so
that it is clear that it applies to the NFS server side
only. It also avoids a name conflict with the NFS_MAXDATA
defined in rpcsvc/nfs_prot.h, that is used for userland RPC.
Diffstat (limited to 'sys/fs/nfs/nfsproto.h')
| -rw-r--r-- | sys/fs/nfs/nfsproto.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/sys/fs/nfs/nfsproto.h b/sys/fs/nfs/nfsproto.h index 731be07..b9c18e8 100644 --- a/sys/fs/nfs/nfsproto.h +++ b/sys/fs/nfs/nfsproto.h @@ -54,11 +54,10 @@ #define NFS_VER4 4 #define NFS_V2MAXDATA 8192 #define NFS_MAXDGRAMDATA 16384 -#define NFS_MAXDATA NFS_MAXBSIZE #define NFS_MAXPATHLEN 1024 #define NFS_MAXNAMLEN 255 #define NFS_MAXPKTHDR 404 -#define NFS_MAXPACKET (NFS_MAXDATA + 2048) +#define NFS_MAXPACKET (NFS_SRVMAXIO + 2048) #define NFS_MINPACKET 20 #define NFS_FABLKSIZE 512 /* Size in bytes of a block wrt fa_blocks */ #define NFSV4_MINORVERSION 0 /* V4 Minor version */ @@ -67,6 +66,18 @@ #define NFSV41_CBVERS 4 /* V4.1 CB Version */ #define NFSV4_SMALLSTR 50 /* Strings small enough for stack */ +/* + * This value isn't a fixed value in the RFCs. + * It is the maximum data size supported by NFSv3 or NFSv4 over TCP for + * the server. It should be set to the I/O size preferred by ZFS or + * MAXBSIZE, whichever is greater. + * ZFS currently prefers 128K. + * It used to be called NFS_MAXDATA, but has been renamed to clarify that + * it refers to server side only and doesn't conflict with the NFS_MAXDATA + * defined in rpcsvc/nfs_prot.h for userland. + */ +#define NFS_SRVMAXIO (128 * 1024) + /* Stat numbers for rpc returns (version 2, 3 and 4) */ /* * These numbers are hard-wired in the RFCs, so they can't be changed. |
