Communication benchmarks with the Ancor Fibre Channel Fabric

Communications between three machines

We performed two kind of experiments based on three active machines connected around the switch. The first one consists of one machine (the most powerful) acting as a sender and the two other machines acting as receivers alternatively. The second one consists of one machine (always the most powerful) acting as a receiver and two machines acting as senders alternatively. For both experiments, Read/Write in a non blocking mode and in a blocking mode have been tested and results are reported hereinafter.

For all the charts displayed in this paragraph, the legend is as follows:

- case of two senders and a receiver:

• - the dashdot line represents the performance curve of the sender1

• - the star line represents the theoretical performance curve of the sender1

• - the solid line represents the performance curve of the sender2

• - the circle line represents the theoretical performance line of the sender2

• - the dashed line represents the performance curve of the receiver

• - the plus line represents the theoretical performance curve of the receiver

• - the dotted line represents the maximum theoretical speed of an optic fibre

• - the dashdot line represents the performance curve of the receiver1

• - the star line represents the theoretical performance curve of the receiver1

• - the solid line represents the performance curve of the receiver2

• - the circle line represents the theoretical performance line of the receiver2

• - the dashed line represents the performance curve of the sender

• - the plus line represents the theoretical performance curve of the sender

The theoretical performance curve of the sender1 (respectively sender2) was obtained by measuring the performance of the sender1 (respectively sender2) when transferring some data to the receiver, without any other machine interfering on the network (results of paragraph III.A.). The theoretical performance curve of the receiver has been inferred from the theoretical performance curves of the sender1 and the sender2. The maximum theoretical speed of an optic fibre was indicated only on one graph to recall the uppermost limit towards which the experimental results could tend.

Similarly, the theoretical performance curve of the receiver1 (respectively receiver2) was obtained by measuring the performance of the receiver1 (respectively receiver2) when receiving some data from the sender, without any other machine interfering on the network.

As previously for communications between two machines, figures a display the speed performance, figures b the communication time, and figures c the percentage of CPU time consumed in the measured aggregate communication time.

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