Chelsio Communications Chelsio T5 Guide de l'utilisateur télécharger pdf (Page 53)

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Chapter II. Network (NIC/TOE)

Chelsio T5/T4 Unified Wire For Linux Page 53

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

dynamically balances the load among multiple processors. Chelsio’s T5/T4 network 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

Discovering Chelsio T4/T5 devices ...

Configuring Chelsio T4/T5 devices ...

Tuning eth7

IRQ table length 4

Writing 1 in /proc/irq/62/smp_affinity

Writing 2 in /proc/irq/63/smp_affinity

Writing 4 in /proc/irq/64/smp_affinity

Writing 8 in /proc/irq/65/smp_affinity

eth7 now up and tuned

...

Because there are 4 CPUs on the system, 4 entries of interrupts are assigned. For other T5/T4

network interfaces, you should see similar output message.

Now the receiving traffic is dynamically assigned to one of the system’s CPUs through a T5/T4

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

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 451 452

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Chelsio Communications Chelsio T5 Guide de l'utilisateur Page 53

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