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From: Sean Bruno <sbruno@FreeBSD.org>
Date: Sun, 23 May 2010 19:48:54 +0000 (UTC)
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Subject: svn commit: r208460 - head/usr.sbin/iostat
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Author: sbruno
Date: Sun May 23 19:48:54 2010
New Revision: 208460
URL: http://svn.freebsd.org/changeset/base/208460

Log:
  Explain how the new sub-second interval from changeset:208389 works.
  
  Approved by:	scottl(mentor)
  Obtained from:	Yahoo Inc.
  MFC after:	2 weeks

Modified:
  head/usr.sbin/iostat/iostat.8

Modified: head/usr.sbin/iostat/iostat.8
==============================================================================
--- head/usr.sbin/iostat/iostat.8	Sun May 23 19:46:19 2010	(r208459)
+++ head/usr.sbin/iostat/iostat.8	Sun May 23 19:48:54 2010	(r208460)
@@ -241,7 +241,14 @@ If no repeat
 is specified, the default is infinity.
 The
 .Nm
-command will accept and honor a non-integer number of seconds.
+command will accept and honor a non-integer number of seconds.  Note that
+the interval only has millisecond granularity.  Smaller values will be 
+truncated.
+.Pp
+e.g. -w1.0001 becomes -w1.000
+.Pp
+The interval will also suffer from modifications to hz so your mileage
+may vary.
 .It Fl x
 Show extended disk statistics.
 Each disk is displayed on a line of its own with all available statistics.