Some question about the switch ports' LinkSpeed

Some question about the switch ports' LinkSpeed

[王允彬]

Now I have a Infiniband switch with the rate of a port 20Gb/s.
But my experiment can only work below the LinkSpeed of 1Gb/s.
Is there some methods to limit the rate of the switch. Can QoS work out ?
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Re: Some question about the switch ports' LinkSpeed

[Yevgeny Kliteynik]

Hi,

On 04/Jan/10 15:58, 王允彬 wrote:
> Now I have a Infiniband switch with the rate of a port 20Gb/s.
> But my experiment can only work below the LinkSpeed of 1Gb/s.
> Is there some methods to limit the rate of the switch.

The lowest possible rate in IB is 1x SDR, which is 2.5 Gb/s.
What exactly do you want to limit? What is the test doing?
Do you have control over that code that generates the traffic?

> Can QoS work out ?

QoS (i.e. VL arbitration) kicks in only when the link is
saturated. QoS doesn't have an ability to limit the BW.
It can only limit relative BW part among several streams.

-- Yevgeny

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