Chelsio Communications Chelsio T5 User's Guide download pdf (Page 257)

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XIX. Traffic Management

Chelsio T5/T4 Unified Wire For Linux Page 257

4. Software/Driver Configuration and Fine-tuning

4.1. Traffic Management Rules

Traffic Management supports the following types of scheduler hierarchy levels which can be

configured using the cxgbtool utility:

i. Class Rate Limiting

ii. Class Weighted Round Robin

iii. Channel Rate Limiting

4.1.1. Class Rate Limiting

This scheduler hierarchy level can be used to rate limit individual traffic classes or individual

connections (flow) in a traffic class.

Class rate limiting can be configured using the following command:

[root@host]# cxgbtool <ethX> sched-class params type packet level cl-rl

mode <scheduler-mode> rate-unit <scheduler-rate-unit> rate-mode

<scheduler-rate-mode> channel <Channel No.> class <scheduler-class-index>

max-rate <maximum-rate> pkt-size <Packet size>

Here,

 ethX is the Chelsio interface

 scheduler-mode specifies whether the rule is configured for individual traffic classes or

individual connections (flow) in a traffic class. Possible values include flow or class.

 scheduler-rate-unit specifies whether the rule is configured for bit-rate or packet rate .

Possible values include bits or pkts

 scheduler-rate-mode specifies whether the rule is configured to support a percent of the

channel rate or an effective rate. Possible values include relative or absolute.

 Channel No. is the port on which data is flowing (0-3).

 scheduler-class-index is the TCP traffic class (0-14 for T4 series of adapters and 0-15 for T5

series of adapters).

 maximum-rate is the bit rate (Kbps) for this TCP stream.

 Packet size is the TCP mss size in bytes; for example – for an MTU of 1500, use a packet

size of 1460.

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Chelsio Communications Chelsio T5 User's Guide Page 257

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