sbm

commit 670751a4b736acec3598bea6ef2ab843a0e639ae
parent dc8458f91696f8f808e1537efde130976d47a439
Author: sin <sin@2f30.org>
Date:   Mon, 22 Feb 2016 15:06:38 +0000

Fix minimum delay at 100 ms

CPU usage is minimized dramatically and lower periods are generally
not useful.

Diffstat:
M
sbm.1
 | 
3
++-
M
sbm.c
 | 
4
+++-

2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/sbm.1 b/sbm.1
@@ -23,7 +23,8 @@ is 0, it will loop forever.  This is the default.
 .It Fl d Ar delay
 Sample interface statistics every
 .Ar delay
-ms.  The default is 1000 ms.
+ms.  The default delay is 1000 ms and the minimum delay
+is 100 ms.
 .It Fl i Ar interface
 Monitor the selected
 .Ar interface .
diff --git a/sbm.c b/sbm.c
@@ -225,7 +225,7 @@ loop(char *ifname, long count, struct timeval *delay)
 	clock_gettime_tv(CLOCK_MONOTONIC, &old);
 	sample(ifname, &oldrxbytes, &oldtxbytes, &oldrxpps, &oldtxpps);
 	for (;;) {
-		usleep(1000); /* sleep for 1ms */
+		usleep(100000); /* sleep for 100 ms */
 		sample(ifname, &rxbytes, &txbytes, &rxpps, &txpps);
 		clock_gettime_tv(CLOCK_MONOTONIC, &now);
 		timersub(&now, &old, &diff);
@@ -273,6 +273,8 @@ main(int argc, char *argv[])
 		delay = strtol(EARGF(usage()), &end, 10);
 		if (*end != '\0' || errno)
 			errx(1, "invalid delay");
+		if (delay < 100)
+			errx(1, "minimum delay is 100 ms");
 		break;
 	case 'i':
 		strncpy(ifname, EARGF(usage()), sizeof(ifname));