Solarflare Solarflare XtremeScale series, User Manual, Page: 127 / 400

Solarflare Server Adapter User Guide
Solarflare Adapters on Linux
Issue 20 © Solarflare Communications 2017 120
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.
PCI Express Lane
Configuration
Ensure the adapter is in an x8 slot (2.0 or later), and
that current speed (not the supported speed) reads
back as “x8 and 5GT/s”, or “x8 and 8GT/s”, or “x8
and Unknown”.
CPU Speed Service
(cpuspeed)
Disable with:
/sbin/service cpuspeed stop
CPU Power Service
(cpupower)
Disable with:
systemctl stop cpupower

systemctl disable cpupower
Tuned Service Experiment disabling this with:
systemctl stop tuned

systemctl disable tuned
Busy poll (Linux 3.11 and
later)
Enable with a value of 50µs:
sysctl net.core.busy_poll=50 \

&& sysctl net.core.busy_read=50
Memory bandwidth Ensure memory utilizes all memory channels on
system motherboard.
Intel QuickData (Intel
chipsets only)
Enable in BIOS and install driver:
modprobe ioatdma
Table 25: Latency Tuning Settings
Tuning Parameter How?