Dell QLogic QL45212, Руководство пользователя, Страница: 82 / 101

7–iSCSI Extensions for RDMA
Optimizing Linux Performance
67 BC0154503-00 B
Set CPUs to Maximum Performance Mode
Set the CPU scaling governor to performance by using the following script to set
all CPUs to maximum Performance mode
for CPUFREQ in
/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f
$CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done
Verify that all CPU cores were set to maximum performance mode by typing the
following command:
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
Set Kernel sysctl Settings
Set the kernel sysctl settings as follows:
sysctl -w net.ipv4.tcp_mem="4194304 4194304 4194304"
sysctl -w net.ipv4.tcp_wmem="4096 65536 4194304"
sysctl -w net.ipv4.tcp_rmem="4096 87380 4194304"
sysctl -w net.core.wmem_max=4194304
sysctl -w net.core.rmem_max=4194304
sysctl -w net.core.wmem_default=4194304
sysctl -w net.core.rmem_default=4194304
sysctl -w net.core.netdev_max_backlog=250000
sysctl -w net.ipv4.tcp_timestamps=0
sysctl -w net.ipv4.tcp_sack=1
sysctl -w net.ipv4.tcp_low_latency=1
sysctl -w net.ipv4.tcp_adv_win_scale=1
echo 0 > /proc/sys/vm/nr_hugepages
IRQ Affinity Settings
This example sets CPU core 0, 1, 2 and 3 to IRQ XX, YY, ZZ and XYZ
respectively. This will need to be done for each IRQ assigned to a port (default is
eight queues per port)
systemctl disable irqbalance
systemctl stop irqbalance
cat /proc/interrupts | grep qedr
Shows IRQ assigned to each port queue
echo 1 > /proc/irq/XX/smp_affinity_list
echo 2 > /proc/irq/YY/smp_affinity_list
echo 4 > /proc/irq/ZZ/smp_affinity_list
echo 8 > /proc/irq/XYZ/smp_affinity_list