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perf(quickemu): tune TCG translation cache and enable multithreaded TCG 

- Add TCG-specific runtime optimisations in vm_boot for
cross-architecture VMs
- Detect host RAM and set tb-size to 512 for hosts with >=16GB,
otherwise 256
- Append -accel tcg,tb-size=${TCG_TB_SIZE},thread=multi to QEMU args
- Improve TCG translation cache behaviour and SMP performance for TCG
guests

Signed-off-by: Martin Wimpress <martin@wimpress.org>
This commit is contained in:
Martin Wimpress 2026-01-25 03:03:30 +00:00 committed by Martin Wimpress
parent d8b27e8480
commit 81b99feccd
1 changed files with 51 additions and 13 deletions
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@ -1650,20 +1650,58 @@ function vm_boot() {
# SMM (System Management Mode) is an x86-specific CPU mode used for firmware operations
# and is required for Secure Boot. ARM64 uses different mechanisms for firmware security.
# vmport emulates VMware's I/O port for guest tools, which is also x86-specific.
if [ "${ARCH_VM}" == "aarch64" ]; then
# ARM64 uses 'virt' machine type without x86-specific options
# shellcheck disable=SC2054,SC2206,SC2140
args+=(-machine ${MACHINE_TYPE},accel=${QEMU_ACCEL} ${GUEST_TWEAKS}
${CPU} ${SMP}
-m ${RAM_VM} ${BALLOON}
-pidfile "${VMDIR}/${VMNAME}.pid")
#
# TCG-specific optimisations for cross-architecture emulation:
# - Use -accel tcg,... to specify tb-size and thread options
# - QEMU does not allow both -machine accel= and -accel simultaneously
# - For KVM/HVF, continue using -machine accel= (simpler, no extra options needed)
if [ "${QEMU_ACCEL}" == "tcg" ]; then
local HOST_RAM_GB=0
if [ "${OS_KERNEL}" == "Darwin" ]; then
HOST_RAM_GB=$(($(sysctl -n hw.memsize) / (1024*1024*1024)))
else
HOST_RAM_GB=$(awk '/MemTotal/ {printf "%.0f", $2/1024/1024}' /proc/meminfo)
fi
# Use larger translation cache on hosts with 16GB+ RAM
local TCG_TB_SIZE=256
if [ "${HOST_RAM_GB}" -ge 16 ]; then
TCG_TB_SIZE=512
fi
# shellcheck disable=SC2054,SC2206
args+=(-accel tcg,tb-size=${TCG_TB_SIZE},thread=multi)
if [ "${ARCH_VM}" == "aarch64" ]; then
# ARM64 uses 'virt' machine type without x86-specific options
# shellcheck disable=SC2054,SC2206,SC2140
args+=(-machine ${MACHINE_TYPE} ${GUEST_TWEAKS}
${CPU} ${SMP}
-m ${RAM_VM} ${BALLOON}
-pidfile "${VMDIR}/${VMNAME}.pid")
else
# x86_64 includes SMM (System Management Mode) and vmport options
# shellcheck disable=SC2054,SC2206,SC2140
args+=(-machine ${MACHINE_TYPE},smm=${SMM},vmport=off ${GUEST_TWEAKS}
${CPU} ${SMP}
-m ${RAM_VM} ${BALLOON}
-pidfile "${VMDIR}/${VMNAME}.pid")
fi
else
# x86_64 includes SMM (System Management Mode) and vmport options
# shellcheck disable=SC2054,SC2206,SC2140
args+=(-machine ${MACHINE_TYPE},smm=${SMM},vmport=off,accel=${QEMU_ACCEL} ${GUEST_TWEAKS}
${CPU} ${SMP}
-m ${RAM_VM} ${BALLOON}
-pidfile "${VMDIR}/${VMNAME}.pid")
# KVM/HVF: use -machine accel= (no extra options needed)
if [ "${ARCH_VM}" == "aarch64" ]; then
# ARM64 uses 'virt' machine type without x86-specific options
# shellcheck disable=SC2054,SC2206,SC2140
args+=(-machine ${MACHINE_TYPE},accel=${QEMU_ACCEL} ${GUEST_TWEAKS}
${CPU} ${SMP}
-m ${RAM_VM} ${BALLOON}
-pidfile "${VMDIR}/${VMNAME}.pid")
else
# x86_64 includes SMM (System Management Mode) and vmport options
# shellcheck disable=SC2054,SC2206,SC2140
args+=(-machine ${MACHINE_TYPE},smm=${SMM},vmport=off,accel=${QEMU_ACCEL} ${GUEST_TWEAKS}
${CPU} ${SMP}
-m ${RAM_VM} ${BALLOON}
-pidfile "${VMDIR}/${VMNAME}.pid")
fi
fi
if [ "${guest_os}" == "windows" ] || [ "${guest_os}" == "windows-server" ] || [ "${guest_os}" == "reactos" ] || [ "${guest_os}" == "freedos" ]; then