12–NVMe-oF Configuration with RDMA
Optimizing Performance
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AH0054601-00 B
CPU Frequency (cpufreq.sh)
The following script sets the CPU frequency.
#Usage "./nameofscript.sh"
grep -E '^model name|^cpu MHz' /proc/cpuinfo
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f
$CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
To configure the network or memory settings:
sysctl -w net.ipv4.tcp_mem="16777216 16777216 16777216"
sysctl -w net.ipv4.tcp_wmem="4096 65536 16777216"
sysctl -w net.ipv4.tcp_rmem="4096 87380 16777216"
sysctl -w net.core.wmem_max=16777216
sysctl -w net.core.rmem_max=16777216
sysctl -w net.core.wmem_default=16777216
sysctl -w net.core.rmem_default=16777216
sysctl -w net.core.optmem_max=16777216
sysctl -w net.ipv4.tcp_low_latency=1
sysctl -w net.ipv4.tcp_timestamps=0
sysctl -w net.ipv4.tcp_sack=1
sysctl -w net.ipv4.tcp_window_scaling=0
sysctl -w net.ipv4.tcp_adv_win_scale=1
#
echo noop > /sys/block/nvme0n1/queue/scheduler
#
echo 0 > /sys/block/nvme0n1/queue/add_random
#
echo 2 > /sys/block/nvme0n1/queue/nomerges
NOTE
The following commands apply only to the initiator server.
