Variouse performance improvement/fix/attempts to do so.

base.conf.tmpl

@@ -1,4 +1,3 @@
--name qemu-vm,debug-threads=on
 -boot order=dc
 -machine type=q35,accel=kvm,kernel_irqchip=on
 -smp $NUM_THREADS,sockets=1,cores=$NUM_PROCESSORS,threads=$NUM_THREADS_PER_CORE

config.conf

@@ -1,3 +1,5 @@
 #!/usr/bin/env bash
 
+export PIDFILE=/run/qemu_ex.pid
+export MONITOR=/tmp/qemu_ex.sock
 export NUM_PROCESSORS=4

hardware.conf.tmpl

@@ -1,7 +1,3 @@
--device usb-host,hostbus=1,hostport=6.1
--device usb-host,hostbus=1,hostport=6.2
--device usb-host,hostbus=1,hostport=6.3
--device usb-host,hostbus=1,hostport=6.4
 -device vfio-pci,host=$GPU_ID,multifunction=on,id=gpu,romfile=$GPU_ROM
 -device vfio-pci,host=$AUDIO_ID,id=audio
 -object input-linux,id=kbd11,evdev=/dev/input/by-id/usb-Wooting_WootingTwo_WOOT_001_A01B1852W021H00067-event-if04

start

@@ -130,16 +130,50 @@ read -ra default_arguments -d '' < "$o_default_path" || true
 read -ra hardware_arguments -d '' < "$o_hardware_path" || true
 read -ra specific_arguments -d '' < "$o_specific_path" || true
 
-# append or true to reverse network changes
-$DEBUG $SUDO nice --adjustment=-20 taskset --cpu-list "$(./cpus compute_vm "$NUM_PROCESSORS")" \
-    qemu-system-x86_64 \
-    -name "$VMNAME,process=VMNAME" \
+# preven host from using vm cpus
+
+$SUDO qemu-system-x86_64 \
+    -name "$VMNAME,process=VMNAME,debug-threads=on" \
+    -daemonize -pidfile "$PIDFILE" \
+    -monitor unix:"$MONITOR",server,nowait \
     -drive if=pflash,format=raw,readonly=on,file="$EFI_FIRMWARE" \
     -drive if=pflash,format=raw,file="$EFI_VARS" \
     "${base_arguments[@]}" \
     "${default_arguments[@]}" \
     "${hardware_arguments[@]}" \
     "${specific_arguments[@]}" || true
+$SUDO cat "$PIDFILE"
+$SUDO qemu-affinity \
+    -k $(./cpus decompress_seq "$(./cpus compute_vm $NUM_PROCESSORS)") \
+    -i *:$(./cpus compute_vm $NUM_PROCESSORS) \
+    -- $($SUDO cat "$PIDFILE")
+
+
+host_cpus="$(./cpus compute_host $NUM_PROCESSORS)"
+# $SUDO systemctl set-property --runtime -- user.slice AllowedCPUs="$host_cpus"
+# $SUDO systemctl set-property --runtime -- system.slice AllowedCPUs="$host_cpus"
+# $SUDO systemctl set-property --runtime -- init.slice AllowedCPUs="$host_cpus"
+
+# undo_file=/tmp/vfio-isolate.undo.bin
+# vfio-isolate \
+#     -u "$undo_file" \
+#     drop-caches \
+#     cpuset-modify --cpus C$host_cpus /system.slice \
+#     cpuset-modify --cpus C$host_cpus /user.slice
+
+while [ -f "$PIDFILE" ]; do
+    sleep 1
+done
+
+host_cpus="$(./cpus compute_all)"
+# vfio-isolate \
+#     restore "$undo_file"
+# $SUDO systemctl set-property --runtime -- user.slice AllowedCPUs="$host_cpus"
+# $SUDO systemctl set-property --runtime -- system.slice AllowedCPUs="$host_cpus"
+# $SUDO systemctl set-property --runtime -- init.slice AllowedCPUs="$host_cpus"
+
+# to power down the machine
+# echo system_powerdown | socat - UNIX-CONNECT:"$MONITOR"
 
 NET_CONF_FILE="$NET_CONF_FILE" $SUDO --preserve-env=NET_CONF_FILE \
     ./net delete