Chelsio Communications Chelsio T4 Guía de usuario descargar pdf (Pagina 46)

Chapter II. Network (NIC/TOE)

Receiver Side Scaling (RSS)

Receiver Side Scaling enables the receiving network traffic to scale with the available number of

processors on a modern networked computer. RSS enables parallel receive processing and

etwork controller fully

supports Receiver Side Scaling for IPv4 and IPv6.

This script first determines the number of CPUs on the system and then each receiving queue

is bound to an entry in the system interrupt table and assigned to a specific CPU. Thus, each

receiving queue interrupts a specific CPU through a specific interrupt now. For example, on a 4-

core system, t4_perftune.sh gives the following output:

[root@host]# t4_perftune.sh

...

Configuring Chelsio T4 devices ...

IRQ table length 4

Writing 1 in /proc/irq/36/smp_affinity

Writing 2 in /proc/irq/37/smp_affinity

Writing 4 in /proc/irq/38/smp_affinity

Writing 8 in /proc/irq/39/smp_affinity

eth6 now up and tuned

...

Because there are 4 CPUs on the system, 4 entries of interrupts are assigned. For other T4

network interfaces, you should see similar output message.

               

queue. This achieves a balanced usage among all the processors. This can be verified, for

example, by using the iperf tool. First set up a server on the receiver host:

[root@receiver_host]# iperf –s

Then on the sender host, send data to the server using the iperf client mode. To emulate a

moderate traffic workload, use -P option to request 20 TCP streams from the server:

[root@sender_host]# iperf -c receiver_host_name_or_IP -P 20

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Chelsio Communications Chelsio T4 Guía de usuario Pagina 46