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-id = 2183
-title = "aarch-64 emulation much slower since release 8.1.5 (issue also present on 8.2.1)"
-state = "closed"
-created_at = "2024-02-21T15:44:41.226Z"
-closed_at = "2024-04-12T13:30:03.954Z"
-labels = ["accel: TCG", "target: arm"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2183"
-host-os = "RockyLinux 8"
-host-arch = "x86"
-qemu-version = "8.1.5"
-guest-os = "Linux"
-guest-arch = "ARM"
-description = """Since QEMU 8.1.5 our aarch64 based emulation got much slower. We use a linux 5.4 kernel which we cross-compile with the ARM toolchain. Things that are noticable:
-- Boot time got a lot longer
-- All memory accesses seem to take 3x longer (can be verified by e.g. executing below script, address does not matter):
-```
-date
-for i in $(seq 0 1000); do
-    devmem 0x200000000 2>/dev/null
-done
-date
-```"""
-reproduce = """Just boot an ARM based kernel on the virt machine and execute above script."""
-additional = """I've tried reproducing the issue on the master branch. There the issue is not present. It only seems to be present on releases 8.1.5 and 8.2.1. 
-
-I've narrowed the problem down to following commit on the 8.2 branch (@bonzini): ef74024b76bf285e247add8538c11cb3c7399a1a accel/tcg: Revert mapping of PCREL translation block to multiple virtual addresses.
-
-Let me know if any other information / tests are required."""