Supermicro SYS-1028UX-LL1-B8 Bedienungsanleitung

Low

Latency/Jitter

User’s

Revision 2

Supermicro Low Latency/Jitter Optimization Guide 2

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Manual Revision 2.1

Release Date: April 1, 2016

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Printed in the United States of America

Supermicro Low Latency/Jitter Optimization Guide 3

Int

odu

These instructions are optimized for the SYS-1028UX-LL1/2/3-B8, SYS-1028-UX-CR-LL1/2 and SYS-

6027AX-72RF/TRF- HFT1/2/3 systems. Steps may vary depending on SW application requirements and

operating system.

1.1 OS

1. Minimal OS installation of RHEL.

2. Kernel boot command line options: intel_idle.max_cstate=0

processor.max_cstate=0 idle=poll pcie_aspm=performance mce=ignore_ce

ipmi_si.force_kipmi=0 nmi_watchdog=0 hpet=disabled noht nohz=on nohalt

nosoftlockup isolcpus=x,x (isolcpus option not required if using tuna to isolate

CPU cores)

3. Disable all unnecessary services using CHKCONFIG command.

4. Install cpupowerutils, tuned-adm, tuna, and numactl.

5. Run the following commands to tune your system before running your

application.It is best to script the following commands for ease of execution.

a. Modprobe acpi-cpufreq

b. cpupower set -b 0

c. cpupower frequency-set --governor performance

d. tuned-adm profile latency-performance

e. tuna –S0 –i; tuna –S1 –i

f. service irqbalance stop

1.2 BIOS/IPMI

1. Set “SuperMicro Hyper-Speed” at the highest, appropriate level

3. Set “SuperMicro Hyper-Turbo” as “Enabled”

4. Set IPMI fan speed to FULL.

5. Disabling unused devices such as USB controllers and SCU controller (PCH chipset’s

storage controller) can help reduce system interrupts.

Supermicro Low Latency/Jitter Optimization Guide 4

1.3

NIC Optimizations

1. To locate which NUMA node the NIC is directly connected to:

#cat/sys/class/net/<nic port>/device/numa_node

2. To ascertain which cores are located on the local NUMA node:

#numactl --hardware

3. Finally, use taskset or numactl to bind application to specific CPU cores

Mellanox NIC Acceleration:

Prefix application with: LD_PRELOAD=libvma.so

SolarFlare NIC Acceleration:

Configure the firmware:

i. Download SolarFlare Utilities

ii. #sfupdate –write

iii. #sfboot firmware-variant=ultra-low-latency

Prefix application with: onload --profile=latency

Exablaze NIC Acceleration:

Prefix application with: exasock

1.5

Reading

the CPU

Frequency

nux

To check the CPU frequency consistency in a Linux environment, use the “turbostat

–i 1” command.

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