SGI Altix XE210 Guía de usuario descargar pdf (Pagina 39)

NIC Acceleration Features

007-5476-001 21

The following entry dumps the current settings:

cxgbtool intf qset

The following entry updates the holdoff timer value for queue X to Y usecs:

cxgbtool intf qset X lat Y

NIC Acceleration Features

The adapter supports all widespread acceleration features:

• Checksum ofﬂoad

• TCP segmentation ofﬂoad (TSO)

• Large receive ofﬂoad (LRO)

Checksum ofﬂoad and TSO are controlled through ethtool(8).

Currently, ethtool(8) is not well suited to deal with hardware that supports multiple

receive queues. The interface cxgbtool(8) provides the facility to control LRO on a

per-recieve-queue basis. The following entry dumps the current settings:

cxgbtool intf qset

The following entry disables/enables the LRO capability for queue X:

cxgbtool intf qset X lro [0|1]

Software (SW) Stack Tuning

The SW stack can be tuned to improve TCP performance as follows:

Set net.core.wmem_max=”16777216”

Set net.core.rmem_max=”16777216”

Set net.ipv4.tcp_timestamps=”0”

Set net.ipv4.tcp_rmem=”4096 262144 16777216”

Set net.ipv4.tcp_wmem=”4096 262144 16777216”

Set net.core.optmem_max=”524288”

Set net.core.netdev_max_backlog=”200000”

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SGI Altix XE210 Guía de usuario Pagina 39