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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/108/performance/2183
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
restructure results
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@@ -1,35 +0,0 @@
-performance: 0.945
-boot: 0.916
-graphic: 0.830
-device: 0.789
-semantic: 0.758
-PID: 0.506
-other: 0.505
-vnc: 0.499
-socket: 0.431
-debug: 0.426
-network: 0.298
-permissions: 0.293
-KVM: 0.251
-files: 0.198
-
-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.