Date: Tue, 2 Nov 2021 00:24:54 GMT From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 5a95a6e8e4d9 - main - nfscl: Use a smaller initial delay time for NFSERR_DELAY Message-ID: <202111020024.1A20OsCU011880@gitrepo.freebsd.org>
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The branch main has been updated by rmacklem: URL: https://cgit.FreeBSD.org/src/commit/?id=5a95a6e8e4d9e947b3bb4b4755a7242e1ddd72e7 commit 5a95a6e8e4d9e947b3bb4b4755a7242e1ddd72e7 Author: Rick Macklem <rmacklem@FreeBSD.org> AuthorDate: 2021-11-02 00:21:31 +0000 Commit: Rick Macklem <rmacklem@FreeBSD.org> CommitDate: 2021-11-02 00:21:31 +0000 nfscl: Use a smaller initial delay time for NFSERR_DELAY For NFS RPCs that receive a NFSERR_DELAY reply, the delay time is initially 1sec and then increases exponentially to NFS_TRYLATERDEL. It was found that this delay time is excessive for some NFSv4 servers, which work well with a 1msec delay. A 1sec delay resulted in very slow performance for Remove and Rename when delegations and pNFS were enabled. This patch decreases the initial delay time to 1msec. Found during a recent IETF NFSv4 working group testing event. MFC after: 2 weeks --- sys/fs/nfs/nfs_commonkrpc.c | 30 ++++++++++++++++++++++-------- 1 file changed, 22 insertions(+), 8 deletions(-) diff --git a/sys/fs/nfs/nfs_commonkrpc.c b/sys/fs/nfs/nfs_commonkrpc.c index 423ddb52494f..2235f1077a03 100644 --- a/sys/fs/nfs/nfs_commonkrpc.c +++ b/sys/fs/nfs/nfs_commonkrpc.c @@ -107,6 +107,10 @@ static int nfs_reconnects; static int nfs3_jukebox_delay = 10; static int nfs_skip_wcc_data_onerr = 1; static int nfs_dsretries = 2; +static struct timespec nfs_trylater_max = { + .tv_sec = NFS_TRYLATERDEL, + .tv_nsec = 0, +}; SYSCTL_DECL(_vfs_nfs); @@ -584,12 +588,11 @@ newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp, u_char *retsum, int toplevel, u_int64_t *xidp, struct nfsclsession *dssep) { uint32_t retseq, retval, slotseq, *tl; - time_t waituntil; int i = 0, j = 0, opcnt, set_sigset = 0, slot; int error = 0, usegssname = 0, secflavour = AUTH_SYS; int freeslot, maxslot, reterr, slotpos, timeo; u_int16_t procnum; - u_int nextconn, trylater_delay = 1; + u_int nextconn; struct nfs_feedback_arg nf; struct timeval timo; AUTH *auth; @@ -602,7 +605,11 @@ newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp, struct nfsclsession *sep; uint8_t sessionid[NFSX_V4SESSIONID]; bool nextconn_set; + struct timespec trylater_delay, ts, waituntil; + /* Initially 1msec. */ + trylater_delay.tv_sec = 0; + trylater_delay.tv_nsec = 1000000; sep = dssep; if (xidp != NULL) *xidp = 0; @@ -1144,12 +1151,19 @@ tryagain: (nd->nd_repstat == NFSERR_DELAY && (nd->nd_flag & ND_NFSV4) == 0) || nd->nd_repstat == NFSERR_RESOURCE) { - if (trylater_delay > NFS_TRYLATERDEL) - trylater_delay = NFS_TRYLATERDEL; - waituntil = NFSD_MONOSEC + trylater_delay; - while (NFSD_MONOSEC < waituntil) - (void) nfs_catnap(PZERO, 0, "nfstry"); - trylater_delay *= 2; + /* Clip at NFS_TRYLATERDEL. */ + if (timespeccmp(&trylater_delay, + &nfs_trylater_max, >)) + trylater_delay = nfs_trylater_max; + getnanouptime(&waituntil); + timespecadd(&waituntil, &trylater_delay, + &waituntil); + do { + nfs_catnap(PZERO, 0, "nfstry"); + getnanouptime(&ts); + } while (timespeccmp(&ts, &waituntil, <)); + timespecadd(&trylater_delay, &trylater_delay, + &trylater_delay); /* Double each time. */ if (slot != -1) { mtx_lock(&sep->nfsess_mtx); sep->nfsess_slotseq[slot]++;
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