Solarflare Solarflare XtremeScale series, Руководство пользователя, Страница: 125 / 400

Solarflare Server Adapter User Guide
Solarflare Adapters on Linux
Issue 20 © Solarflare Communications 2017 118
Tuning Recommendations
The following tables provide recommendations for tuning settings for different
applications.
• Throughput ‐ Table 24 on page 118
• Latency ‐ Table 25 on page 119
• Forwarding ‐ Table 26 on page 121
Recommended Throughput Tuning
Table 24 shows recommended tuning settings for throughput:
Table 24: Throughput Tuning Settings
Tuning Parameter How?
MTU Size Configure to maximum supported by network:
/sbin/ifconfig <ethX> mtu <size>
Interrupt moderation Leave at default (Enabled).
TCP/IP Checksum Offload Leave at default (Enabled).
TCP Segmentation Offload Leave at default (Enabled).
TCP Large Receive Offload Leave at default (Enabled).
TCP Protocol Tuning Leave at default for 2.6.16 and later kernels.
For earlier kernels:
sysctl net.core.tcp_rmem 4096 87380 524288

sysctl net.core.tcp_wmem 4096 87380 524288
Receive Side Scaling (RSS) Application dependent
Interrupt affinity &
irqbalance service
Interrupt affinity settings are application
dependent
Stop irq balance service:
/sbin/service irqbalance stop
Reload the drivers to use the driver default
interrupt affinity.
Buffer Allocation Method Leave at default. Some applications may benefit
from specific setting.
The Solarflare driver now supports a single
optimized buffer allocation strategy and any value
set by the rx_alloc_method parameter is ignored.