Date: Tue, 1 Jun 2021 01:42:25 GMT From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: a604806bf73f - stable/12 - nfsd: Reduce the callback timeout to 800msec Message-ID: <202106010142.1511gPZ6051786@gitrepo.freebsd.org>
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The branch stable/12 has been updated by rmacklem: URL: https://cgit.FreeBSD.org/src/commit/?id=a604806bf73fdac21485bcb14ac6d56cb66b5210 commit a604806bf73fdac21485bcb14ac6d56cb66b5210 Author: Rick Macklem <rmacklem@FreeBSD.org> AuthorDate: 2021-05-18 23:17:58 +0000 Commit: Rick Macklem <rmacklem@FreeBSD.org> CommitDate: 2021-06-01 01:39:27 +0000 nfsd: Reduce the callback timeout to 800msec Recent discussion on the nfsv4@ietf.org mailing list confirmed that an NFSv4 server should reply to an RPC in less than 1second. If an NFSv4 RPC requires a delegation be recalled, the server will attempt a CB_RECALL callback. If the client is not responsive, the RPC reply will be delayed until the callback times out. Without this patch, the timeout is set to 4 seconds (set in ticks, but used as seconds), resulting in the RPC reply taking over 4sec. This patch redefines the constant as being in milliseconds and it implements that for a value of 800msec, to ensure the RPC reply is sent in less than 1second. This patch only affects mounts from clients when delegations are enabled on the server and the client is unresponsive to callbacks. (cherry picked from commit fc0dc94029df8150301b925bda690b20d9d0bcbf) --- sys/fs/nfs/nfs.h | 2 +- sys/fs/nfs/nfs_commonkrpc.c | 10 ++++++---- 2 files changed, 7 insertions(+), 5 deletions(-) diff --git a/sys/fs/nfs/nfs.h b/sys/fs/nfs/nfs.h index c6fb59fa6b64..de35f40f40d0 100644 --- a/sys/fs/nfs/nfs.h +++ b/sys/fs/nfs/nfs.h @@ -50,7 +50,7 @@ #define NFS_MAXRCVTIMEO 60 /* 1 minute in seconds */ #define NFS_MINIDEMTIMEO (5 * NFS_HZ) /* Min timeout for non-idempotent ops*/ #define NFS_MAXREXMIT 100 /* Stop counting after this many */ -#define NFSV4_CALLBACKTIMEO (2 * NFS_HZ) /* Timeout in ticks */ +#define NFSV4_CALLBACKTIMEO 800 /* Timeout in msec */ #define NFSV4_CALLBACKRETRY 5 /* Number of retries before failure */ #define NFSV4_SLOTS 64 /* Number of slots, fore channel */ #define NFSV4_CBSLOTS 8 /* Number of slots, back channel */ diff --git a/sys/fs/nfs/nfs_commonkrpc.c b/sys/fs/nfs/nfs_commonkrpc.c index b6fe49b8e470..d583b1c80c3c 100644 --- a/sys/fs/nfs/nfs_commonkrpc.c +++ b/sys/fs/nfs/nfs_commonkrpc.c @@ -762,11 +762,13 @@ tryagain: * use the same xid. */ if (nmp == NULL) { - timo.tv_usec = 0; - if (clp == NULL) + if (clp == NULL) { timo.tv_sec = NFSV4_UPCALLTIMEO; - else - timo.tv_sec = NFSV4_CALLBACKTIMEO; + timo.tv_usec = 0; + } else { + timo.tv_sec = NFSV4_CALLBACKTIMEO / 1000; + timo.tv_usec = NFSV4_CALLBACKTIMEO * 1000; + } } else { if (nrp->nr_sotype != SOCK_DGRAM) { timo.tv_usec = 0;
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