103 lines
3.1 KiB
Bash
Executable file
103 lines
3.1 KiB
Bash
Executable file
#!/bin/sh
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. /usr/lib/tuned/functions
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ltanfile=/sys/module/kvm/parameters/lapic_timer_advance_ns
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QEMU=$(type -P qemu-kvm || echo /usr/libexec/qemu-kvm)
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TSCDEADLINE_LATENCY="/usr/share/qemu-kvm/tscdeadline_latency.flat"
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if [ ! -f "$TSCDEADLINE_LATENCY" ]; then
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TSCDEADLINE_LATENCY="/usr/share/tuned/tscdeadline_latency.flat"
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fi
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run_tsc_deadline_latency()
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{
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if [ ! -f /sys/module/kvm/parameters/lapic_timer_advance_ns ]; then
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echo "/sys/module/kvm/parameters/lapic_timer_advance_ns not found"
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return 1
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fi
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dir=`mktemp -d`
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for i in `seq 1000 500 7000`; do
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echo $i > /sys/module/kvm/parameters/lapic_timer_advance_ns
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chrt -f 1 taskset -c $1 $QEMU -enable-kvm -device pc-testdev \
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-device isa-debug-exit,iobase=0xf4,iosize=0x4 \
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-display none -serial stdio -device pci-testdev \
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-kernel "$TSCDEADLINE_LATENCY" \
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-cpu host | grep latency | cut -f 2 -d ":" > $dir/out
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A=0
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while read l; do
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A=$(($A+$l))
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done < $dir/out
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lines=`wc -l $dir/out | cut -f 1 -d " "`
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ans=$(($A/$lines))
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echo $i: $ans
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done
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}
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start() {
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python /usr/libexec/tuned/defirqaffinity.py "remove" "$TUNED_isolated_cores_expanded" &&
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retval = "$?"
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if [ ! $retval -eq 0 ]; then
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return $retval
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fi
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setup_kvm_mod_low_latency
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if [ -f lapic_timer_adv_ns.cpumodel ]; then
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curmodel=`cat /proc/cpuinfo | grep "model name" | cut -f 2 -d ":" | uniq`
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genmodel=`cat lapic_timer_adv_ns.cpumodel`
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if [ "$curmodel" != "$genmodel" ]; then
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rm -f lapic_timer_adv_ns
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rm -f lapic_timer_adv_ns.cpumodel
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fi
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fi
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if [ -f $ltanfile -a ! -f ./lapic_timer_adv_ns ]; then
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if [ -f "$TSCDEADLINE_LATENCY" ]; then
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tempdir=`mktemp -d`
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isolatedcpu=`echo "$TUNED_isolated_cores_expanded" | cut -f 1 -d ","`
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run_tscdeadline_latency $isolatedcpu > $tempdir/lat.out
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sh ./find-lapictscdeadline-optimal.sh $tempdir/lat.out > $tempdir/opt.out
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if [ $? -eq 0 ]; then
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echo `cat $tempdir/opt.out | cut -f 2 -d ":"` > ./lapic_timer_adv_ns
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curmodel=`cat /proc/cpuinfo | grep "model name" | cut -f 2 -d ":" | uniq`
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echo "$curmodel" > lapic_timer_adv_ns.cpumodel
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fi
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fi
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fi
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if [ -f $ltanfile -a -f ./lapic_timer_adv_ns ]; then
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echo `cat ./lapic_timer_adv_ns` > $ltanfile
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fi
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disable_ksm
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return $retval
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}
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stop() {
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[ "$1" = "full_rollback" ] && teardown_kvm_mod_low_latency
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python /usr/libexec/tuned/defirqaffinity.py "add" "$TUNED_isolated_cores_expanded"
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enable_ksm
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return "$?"
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}
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verify() {
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python /usr/libexec/tuned/defirqaffinity.py "verify" "$TUNED_isolated_cores_expanded"
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retval = "$?"
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if [ $retval -eq 0 -a -f /sys/module/kvm/parameters/kvmclock_periodic_sync ]; then
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retval = `cat /sys/module/kvm/parameters/kvmclock_periodic_sync`
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fi
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if [ $retval -eq 0 -a -f /sys/module/kvm_intel/parameters/ple_gap ]; then
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retval = `cat /sys/module/kvm_intel/parameters/ple_gap`
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fi
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return $retval
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}
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process $@
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