13–NVMe-oF Configuration with RDMA
Optimizing Performance
239
BC0154501-00 P
CPUID=$((CPUID*OFFSET))
for ((A=1; A<=${NUM_FP}; A=${A}+1)) ; do
INT='grep -m $A $eth /proc/interrupts | tail -1 | cut -d ":" -f 1'
SMP='echo $CPUID 16 o p | dc'
echo ${INT} smp affinity set to ${SMP}
echo $((${SMP})) > /proc/irq/$((${INT}))/smp_affinity
CPUID=$((CPUID*FACTOR))
if [ ${CPUID} -gt ${MAXCPUID} ]; then
CPUID=1
CPUID=$((CPUID*OFFSET))
fi
done
done
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
