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xbstat(1M)							    xbstat(1M)

NAME    [Toc]    [Back]

     xbstat - monitor Crossbow (Xbow) traffic

SYNOPSIS    [Toc]    [Back]

     xbstat [-d	devname] [-t sec]

DESCRIPTION    [Toc]    [Back]

     xbstat monitors the traffic from and to each of the active	slots of the
     Crossbow (Xbow) i/o interconnect.	It reports the total number of
     micropackets sent from and	received at each link.	It also	reports	the
     LLP retries at each link.

     The -d devname option specifies which Crossbow to monitor in a multiCrossbow
 system.  devname should be a valid Xtalk monitor point under the
     /hw graph.	 If the	devname	is not explicitly specified, xbstat monitors
     /dev/xbmon	by default.

     The -t sec	option determines the duration of time in units	of seconds
     that the Xbow traffic will	be monitored.  If this option is not is
     selected, the monitoring continues	until the user terminates it with a
     CTRL-C (or	intr).

OVERVIEW    [Toc]    [Back]

     xbstat gets its information from the two hardware performance counters
     and the Link Auxiliary Status Registers in	the Xbow.  It uses a
     multiplexing technique to sample and report the SRC and DST link traffic
     at	each XBow slot.	 Cumulative counts since the beginning of the
     monitoring	period are reported in units of	micropackets.

     xbstat is capable of monitoring any selected Xbow in a multi-Xbow system.
     Use find /hw -name	mon -print | grep xtalk	to find	all possible Xbow
     monitor points. A specific	Xbow can be selected in	two ways: explicitly,
     as	a devname  with	the -d option, or implicitly, as a soft	link to

     When specifying the Xbow implicitly, first	create a symbolic link between
     the selected Xbow monitor point and /dev/xbmon before invoking this
     command. See examples below.

     Multiple instances	of the command selecting different Xbows can be
     executed at a time.  However, one Xbow can	be specified at	a time with
     each instance of the command.

     The monitor data is statistical since the traffic over many links and
     slots is sampled or scanned during	any given monitoring period.  All live
     links are monitored for the same amount of	time during any	monitoring

									Page 1

xbstat(1M)							    xbstat(1M)

     Note that each slot consists of two links:	SRC (Source) and

     Slot	   Physical slot being monitored.  I/O slots will be labeled
		   as IO1 through IO12,	node slots will	have labels N1 through
		   N4. Devices connected to each slot vary and are platform
		   and configuration dependent.

     Flags	   Selected flags from the Link(x) Auxiliary Status register.

		   Currently only the "Widget Present" flag is shown to
		   indicate an active/live slot.

     Source	   Number of micropackets sent from the	SRC link of this slot.

     Destination   Number of micropackets received at the DST link of this

     RcRtry	   Number of LLP receive retries.

     TxRtry	   Number of LLP transmit retries.

EXAMPLES    [Toc]    [Back]

	  xbstat -d /hw/module/1/slot/n1/node/xtalk/0/mon -t 60

     Monitors for 60 seconds the traffic at the	Xbow specified.

	  ln -s	/hw/node/xtalk/0/mon /dev/xbmon;

	  xbstat -t 60

     Monitors for 60 seconds the traffic at the	Xbow associated	with


     Monitors traffic until terminated by CTRL-C at the	Xbow associated	with

FILES    [Toc]    [Back]


RESTRICTIONS    [Toc]    [Back]

     The command requires root privilege to run.

NOTES    [Toc]    [Back]

     When a Xbow is not	explicitly specified, make sure	that /dev/xbmon	points
     to	an existing Xbow in the	system.

									Page 2

xbstat(1M)							    xbstat(1M)

     linkstat(1), nstats(1), sn(1), hwgraph(4).

									PPPPaaaaggggeeee 3333
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