Chelsio Communications Chelsio T4, Инструкция по установке и эксплуатации

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Chapter XIV. UDP Segmentation Offload and Pacing
Chelsio T5/T4 Unified Wire for Linux
Page 205
4.2. Configuring UDP Pacing
Now that the application has been modified
to associate the application’s UDP socket to a
particular UDP traffic class, the pacing of that socket’s traffic can be set using the
cxgbtool
utility.
i. Bring up the network interface:
[root@host~]# ifconfig <ethX> up
ii. Run the following command:
[root@host~]# cxgbtool <ethX> sched-class params type packet level cl-rl
mode flow rate-unit bits rate-mode absolute channel <Channel No.> class
<scheduler-class-index> max-rate <maximum-rate> pkt-size <Packet size>
Here,

ethX is the Chelsio interface

Channel No. is the port on which data is flowing (0-3)

scheduler-class-index is the UDP traffic class (0-14 for T4 series of adapters and 0-15 for T5
series of adapters) set in the SOL_SCHEDCLASS socket option in the application in section
4.1.

maximum-rate is the bit rate (Kbps) for this UDP stream. This value should be in the range
of 50 Kbps to 50 Mbps for T4 adapters. For T5 adapters, the value should be in the range of
100 kbps to 1 Gbps.

Packet size is the UDP packet payload size in bytes; it should be equal to the value set in
the SO_FRAMESIZE socket option in the application in section 4.1.