1 files changed, 50 insertions, 0 deletions
diff --git a/results/classifier/118/performance/2183 b/results/classifier/118/performance/2183
new file mode 100644
index 00000000..c7c0984c
--- /dev/null
+++ b/results/classifier/118/performance/2183
@@ -0,0 +1,50 @@
+performance: 0.945
+kernel: 0.925
+boot: 0.916
+architecture: 0.898
+graphic: 0.830
+arm: 0.804
+device: 0.789
+semantic: 0.758
+virtual: 0.642
+hypervisor: 0.577
+TCG: 0.537
+ppc: 0.525
+PID: 0.506
+VMM: 0.504
+vnc: 0.499
+risc-v: 0.498
+user-level: 0.433
+socket: 0.431
+debug: 0.426
+network: 0.298
+permissions: 0.293
+KVM: 0.251
+register: 0.239
+files: 0.198
+peripherals: 0.178
+assembly: 0.145
+i386: 0.141
+mistranslation: 0.116
+x86: 0.016
+
+aarch-64 emulation much slower since release 8.1.5 (issue also present on 8.2.1)
+Description of problem:
+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
+```
+Steps to reproduce:
+Just boot an ARM based kernel on the virt machine and execute above script.
+Additional information:
+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.