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- Display current settings when run without options.

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- Revise a manpage to NOT sound confusing. [1]

In collaboration with:	sat [1]
This commit is contained in:
Ruslan Ermilov 2009-12-26 08:36:02 +00:00
parent e8406463e8
commit 48660452c1
2 changed files with 30 additions and 15 deletions
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33
sbin/nfsiod/nfsiod.8
View File

@ -28,7 +28,7 @@
.\" From: @(#)nfsiod.8 8.2 (Berkeley) 2/22/94 .\" From: @(#)nfsiod.8 8.2 (Berkeley) 2/22/94
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd September 22, 1994 .Dd December 26, 2009
.Dt NFSIOD 8 .Dt NFSIOD 8
.Os .Os
.Sh NAME .Sh NAME
@ -42,33 +42,39 @@ asynchronous I/O server
.Sh DESCRIPTION .Sh DESCRIPTION
The The
.Nm .Nm
utility is a kernel process which runs on an utility controls the maximum number of
.Nm
kernel processes which run on an
.Tn NFS .Tn NFS
client machine to service asynchronous I/O requests to its server. client machine to service asynchronous I/O requests to its server.
It improves performance but is not required for correct operation. Having
.Nm
kernel processes
improves performance but is not required for correct operation.
.Pp .Pp
This program controls the maximum number of processes that the kernel runs. The option is as follows:
.Pp
The options are as follows:
.Bl -tag -width indent .Bl -tag -width indent
.It Fl n .It Fl n
Specify how many servers are permitted to be started. Specify how many processes are permitted to be started.
.El .El
.Pp .Pp
A client should run enough daemons to handle its maximum Without an option,
.Nm
displays the current settings.
A client should allow enough number of processes to handle its maximum
level of concurrency, typically four to six. level of concurrency, typically four to six.
.Pp .Pp
If If
.Nm .Nm
detects that the running kernel does not include detects that the running kernel does not include
.Tn NFS .Tn NFS
support, it will attempt to load a loadable kernel module containing support, it will attempt to load a kernel module containing
.Tn NFS .Tn NFS
code, using code, using
.Xr kldload 2 . .Xr kldload 2 .
If this fails, or no If this fails, or no
.Tn NFS .Tn NFS
KLD was available, module was available,
.Nm .Nm
exits with an error. exits with an error.
.Sh EXIT STATUS .Sh EXIT STATUS
@ -85,3 +91,10 @@ The
.Nm .Nm
utility first appeared in utility first appeared in
.Bx 4.4 . .Bx 4.4 .
.Pp
Starting with
.Fx 5.0 ,
the utility no longer starts daemons, but only serves as a vfs
loader and
.Xr sysctl 3
wrapper.

12
sbin/nfsiod/nfsiod.c
View File

@ -89,12 +89,12 @@ main(int argc, char *argv[])
case 'n': case 'n':
num_servers = atoi(optarg); num_servers = atoi(optarg);
if (num_servers < 1) { if (num_servers < 1) {
warnx("nfsiod count %d; reset to %d", warnx("nfsiod count %u; reset to %d",
num_servers, 1); num_servers, 1);
num_servers = 1; num_servers = 1;
} }
if (num_servers > MAXNFSDCNT) { if (num_servers > MAXNFSDCNT) {
warnx("nfsiod count %d; reset to %d", warnx("nfsiod count %u; reset to %d",
num_servers, MAXNFSDCNT); num_servers, MAXNFSDCNT);
num_servers = MAXNFSDCNT; num_servers = MAXNFSDCNT;
} }
@ -109,9 +109,6 @@ main(int argc, char *argv[])
if (argc > 0) if (argc > 0)
usage(); usage();
if (num_servers == 0)
exit(0); /* no change */
len = sizeof iodmin; len = sizeof iodmin;
error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0); error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0);
if (error < 0) if (error < 0)
@ -120,6 +117,11 @@ main(int argc, char *argv[])
error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0); error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0);
if (error < 0) if (error < 0)
err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");
if (num_servers == 0) { /* no change */
printf("vfs.nfs.iodmin=%u\nvfs.nfs.iodmax=%u\n",
iodmin, iodmax);
exit(0);
}
/* Catch the case where we're lowering num_servers below iodmin */ /* Catch the case where we're lowering num_servers below iodmin */
if (iodmin > num_servers) { if (iodmin > num_servers) {
iodmin = num_servers; iodmin = num_servers;