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Resource Management

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bucket controls peak bandwidth during bursts. Each nfshaper instance can accept

parameters to control average bps, peak bps and burst size.

The procfs interface described in Using Network Filters is used to attach an

nfshaper instance to a virtual machine, detach an nfshaper instance from a

virtual machine, query the status of an nfshaper instance or issue a dynamic

command to an active nfshaper instance.

Commands

config <bpsAverage> <bpsPeak> <burstSize> [<periodPeak>]

Dynamically reconfigure the shaper to use the specified parameters: average

bandwidth of <bpsAverage> bits per second, peak bandwidth of <bpsPeak>

bits per second, maximum burst size of <burstSize> bytes and an optional peak

bandwidth enforcement period <periodPeak> in milliseconds. Each parameter

may optionally use the suffix k (1k = 1024) or m (1m = 1024k).

maxq <nPackets>

Dynamically set the maximum number of queued packets to <nPackets>.

reset

Dynamically reset shaper statistics.

Examples

Suppose that you want to attach a traffic shaper to limit the transmit bandwidth of

the virtual machine with ID 104. To create and attach a new shaper instance, issue an

xmitpush command as described in Using Network Filters on page 253. Note that

root privileges are required to attach a filter.

echo "104 nfshaper 1m 2m 160k" > \

/proc/vmware/filters/xmitpush

This attaches a traffic shaper with average bandwidth of 1Mbps, peak bandwidth of

2Mbps and maximum burst size of 160Kb.

Note: This command should be entered on a single line. Do not type the backslash.

To find the number of the attached nfshaper instance, query the network filtering

status, which contains a list of all filters attached to virtual machines:

cat /proc/vmware/filters/status

Suppose the reported status information indicates that the filter attached to virtual

machine 104 is nfshaper.2.104. The procfs node for this filter can be used to

obtain status information:

cat /proc/vmware/filters/xmit/nfshaper.2.104

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Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Bedienungsanleitung Seite 255