
Issue 11
© Solarflare Communications 2014
290
Solarflare Server Adapter
User Guide
Recommended Latency Tuning
Recommended Forwarding Tuning
Table 70: Latency Tuning Settings
Tuning Parameter
How?
MTU Size to maximum
supported by network
Leave at default
Interrupt moderation
Disable with:
sfxge.conf
TCP/IP Checksum Offload
Leave at default
TCP Segmentation Offload
Leave at default
TCP Large Receive Offload
Leave at default
TCP Protocol Tuning
Leave at default, but changing does not impact latency
Receive Side Scaling
Application dependent
Buffer Allocation Method
Leave at default
PCI Express Lane
Configuration
Ensure current speed (not the supported speed) reads back
as “x8 and 5Gb/s” Or “x8 and Unknown”
CPU Power Management
Disable with:
/etc/power.conf
Memory bandwidth
Ensure Memory utilizes all memory channels on system
motherboard
Table 71: Forwarding Tuning Settings
Tuning Parameter
How?
MTU Size to maximum
supported by network
ifconfig sfxge<X> mtu <size>
Interrupt moderation
Leave at default
TCP/IP Checksum Offload
Leave at default
TCP Segmentation Offload
Leave at default
TCP Large Receive Offload
Leave at default
TCP Protocol Tuning
Can leave at default
Receive Side Scaling (RSS)
sfxge.conf
Buffer Allocation Method
Leave at default