id = 1321
title = "qemu-system-i386 runs slow after upgrading legacy project from qemu 2.9.0  to 7.1.0"
state = "closed"
created_at = "2022-11-18T07:15:19.339Z"
closed_at = "2025-02-10T15:53:25.238Z"
labels = ["Regression", "icount", "workflow::Needs Info"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1321"
host-os = "freedos"
host-arch = "x86_64"
qemu-version = "2.9.0/7.1.0"
guest-os = "freedos"
guest-arch = "i386"
description = """Using several custom serial and irq devices including timers.
The same code (after some customisation in order to compile with new 7.1.0 API and meson build system runs about 50% slower.
We had to remove "-icount 4" switch which worked fine with 2.9.0 just to get to this point.
Even running with multi-threaded tcg did not help.
We don't use the new ptimer API but rather the old QEMUTimer.
Any suggestions to why we encounter this vast performance degradation?"""
reproduce = "n/a"
additional = "n/a"