Chelsio Communications Chelsio T4 Uživatelská příručka stáhnout pdf (Strana 45)

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Chapter II. Network (NIC/TOE)

4. Software/Driver Configuration and Fine-tuning

4.1. Instantiate Virtual Functions (SR-IOV)

To instantiate the Virtual functions, load the cxgb4 driver with num_vf parameter with a non-zero

value. For example:

[root@host]# modprobe cxgb4 num_vf=1,0,0,0

The number(s) provided for num_vf parameter specifies the number of Virtual Functions to be

instantiated per Physical Function. The Virtual Functions can be assigned to Virtual Machines

(Guests). A maximum of 64 Virtual Functions can be instantiated with 16 Virtual Functions per

Physical Function. Loading the cxgb4 driver with num_vf parameter loads the cxgb4vf module

(the driver for Virtual Functions) in the host by default. Hence unload the cxgb4vf module (on

the host) before assigning Virtual Functions to the Virtual Machines (Guest s), using the

following command:

[root@host]# rmmod cxgb4vf

4.2. Performance tuning

In order to auto tune the system and TOE devices for best performance, Chelsio recommends

installing the tools which will copy t4_perftune.sh script to /sbin directory. Run the script by

using the following command:

[root@host]# t4_perftune.sh

This script will configure RSS and enable Interrupt Coalescing.

To get familiar with physical and virtual function terminologies, please refer the

PCI Express specification.

Note

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