Xilinx Alveo X3522 User Manual page 42

Table 4: Throughput Tuning Settings (cont'd)
Tuning Parameter
PCI Express lane configuration
CPU Speed service (cpuspeed)
Memory bandwidth
Intel QuickData (Intel chipsets only)
Recommended Latency Tuning
The following table shows recommended tuning settings for latency.
Table 5: Latency Tuning Settings
Tuning Parameter
Interrupt moderation
TCP/IP checksum offload
TCP protocol tuning
Interrupt affinity & irqbalance service
PCI Express lane configuration
CPU Speed service (cpuspeed)
CPU Power service (cpupower)
Tuned service
Memory bandwidth
UG1523 (v1.0) October 18, 2022
Alveo X3522 User Guide
How?
Ensure the adapter is in an ×8 slot (3.0 or later), and that
current speed (not the supported speed) reads back as "x8
and 8GT/s", or "x8 and 16GT/s", or "x8 and Unknown".
Leave enabled.
Ensure memory uses all memory channels on system
motherboard.
Enable in BIOS and install driver:
modprobe ioatdma
How?
Disable with:
ethtool -C <interface> rx-usecs-irq 0
Leave at default (Enabled).
Leave at default, but changing does not impact latency.
Interrupt affinity settings are application dependent
Stop irqbalance service:
/sbin/service irqbalance stop
Reload the drivers to use the driver default interrupt affinity.
Ensure the adapter is in an ×8 slot (3.0 or later), and that
current speed (not the supported speed) reads back as "x8
and 8GT/s", or "x8 and 16GT/s", or "x8 and Unknown".
Disable with:
/sbin/service cpuspeed stop
Disable with:
systemctl stop cpupower
systemctl disable cpupower
Experiment disabling this with:
systemctl stop tuned
systemctl disable tuned
Ensure memory uses all memory channels on system
motherboard.
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Chapter 5: Tuning
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