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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-03 19:39:53 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-03 19:39:53 +0200 |
| commit | dee4dcba78baf712cab403d47d9db319ab7f95d6 (patch) | |
| tree | 418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/108/performance/2183 | |
| parent | 4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff) | |
| download | emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip | |
restructure results
Diffstat (limited to 'results/classifier/108/performance/2183')
| -rw-r--r-- | results/classifier/108/performance/2183 | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/results/classifier/108/performance/2183 b/results/classifier/108/performance/2183 deleted file mode 100644 index 34cefbea..00000000 --- a/results/classifier/108/performance/2183 +++ /dev/null @@ -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. |
