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NFS over TCP retransmit behavior should default to a 60 second time out,

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mimicing the NFS reference implementation.

NFS over TCP does not need fast retransmit timeouts, since network loss
and congestion are managed by the transport (TCP), unlike with NFS over
UDP.  A long timeout prevents the unnecessary retransmission of non-
idempotent NFS requests.

Reviewed by:	mohans, silby, rees?
Sponsored by:	Network Appliance, Incorporated
This commit is contained in:
Chuck Lever 2006-05-23 18:48:07 +00:00
parent 94163ea283
commit 6d0699a5ba
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=158860
3 changed files with 17 additions and 5 deletions
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10
sys/nfs4client/nfs4_vfsops.c
View File

@ -245,12 +245,18 @@ nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp)
int maxio;
s = splnet();
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context.
* no sense in that context. Also, set appropriate retransmit
* and soft timeout behavior.
*/
if (argp->sotype == SOCK_STREAM)
if (argp->sotype == SOCK_STREAM) {
nmp->nm_flag &= ~NFSMNT_NOCONN;
nmp->nm_flag |= NFSMNT_DUMBTIMR;
nmp->nm_timeo = NFS_MAXTIMEO;
nmp->nm_retry = NFS_RETRANS_TCP;
}
nmp->nm_flag &= ~NFSMNT_RDIRPLUS;

3
sys/nfsclient/nfs.h
View File

@ -53,7 +53,8 @@
#define NFS_MAXTIMEO (60 * NFS_HZ) /* Max timeout to backoff to */
#define NFS_MINIDEMTIMEO (5 * NFS_HZ) /* Min timeout for non-idempotent ops*/
#define NFS_MAXREXMIT 100 /* Stop counting after this many */
#define NFS_RETRANS 10 /* Num of retrans for soft mounts */
#define NFS_RETRANS 10 /* Num of retrans for UDP soft mounts */
#define NFS_RETRANS_TCP 2 /* Num of retrans for TCP soft mounts */
#define NFS_MAXGRPS 16 /* Max. size of groups list */
#ifndef NFS_MINATTRTIMO
#define NFS_MINATTRTIMO 3 /* VREG attrib cache timeout in sec */

9
sys/nfsclient/nfs_vfsops.c
View File

@ -545,10 +545,15 @@ nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp)
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context.
* no sense in that context. Also, set up appropriate retransmit
* and soft timeout behavior.
*/
if (argp->sotype == SOCK_STREAM)
if (argp->sotype == SOCK_STREAM) {
nmp->nm_flag &= ~NFSMNT_NOCONN;
nmp->nm_flag |= NFSMNT_DUMBTIMR;
nmp->nm_timeo = NFS_MAXTIMEO;
nmp->nm_retry = NFS_RETRANS_TCP;
}
/* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
if ((argp->flags & NFSMNT_NFSV3) == 0)