fio: Add a script to prep a system for benchmarks

Also update the example fio file

Change-Id: I2a9074d524072e95340cc0e87041e87e3bb7d4f8
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/362069
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

examples/nvme/fio_plugin/full_bench.fio

@@ -0,0 +1,43 @@
+[global]
+ioengine=./examples/nvme/fio_plugin/fio_plugin
+thread=1
+group_reporting=1
+direct=1
+verify=0
+norandommap=1
+cpumask=1
+percentile_list=50:99:99.9:99.99:99.999
+
+[precondition-trim]
+description="Trim the entire device"
+rw=trim
+iodepth=128
+bs=1M
+
+[precondition-sequential]
+stonewall
+description="Sequentially write to the device twice"
+rw=write
+iodepth=128
+bs=128k
+loops=2
+
+[4k_randwrite_qd1]
+stonewall
+description="4KiB Random Write QD=1"
+bs=4k
+rw=randwrite
+iodepth=1
+time_based=1
+ramp_time=60
+runtime=240
+
+[4k_randread_qd1]
+stonewall
+description="4KiB Random Read QD=1"
+bs=4k
+rw=randread
+iodepth=1
+time_based=1
+ramp_time=60
+runtime=240

scripts/prep_benchmarks.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+
+echo -n "Placing all CPUs in performance mode..."
+for governor in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do
+	echo -n performance > $governor
+done
+echo "Done"
+
+echo -n "Disabling irqbalance service..."
+service irqbalance stop 2> /dev/null
+echo "Done"
+
+echo -n "Moving all interrupts off of core 0..."
+count=`expr $(nproc) / 4`
+cpumask="e"
+for ((i=1; i<$count; i++)); do
+	if [ `expr $i % 8` -eq 0 ]; then
+		cpumask=",$cpumask"
+	fi
+	cpumask="f$cpumask"
+done
+for file in /proc/irq/*/smp_affinity; do
+	echo "$cpumask" > $file 2> /dev/null
+done
+echo "Done"
+
+echo -n "Configuring kernel blk-mq for for NVMe SSDs..."
+for queue in /sys/block/nvme*n*/queue; do
+	if [ -f "$queue/nomerges" ]; then
+		echo "1" > $queue/nomerges
+	fi
+
+	if [ -f "$queue/io_poll" ]; then
+		echo "1" > $queue/io_poll
+	fi
+
+	if [ -f "$queue/io_poll_delay" ]; then
+		echo "-1" > $queue/io_poll_delay
+	fi
+done
+echo "Done"