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Diffstat (limited to 'results/classifier/118/performance/1895703')
| -rw-r--r-- | results/classifier/118/performance/1895703 | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/results/classifier/118/performance/1895703 b/results/classifier/118/performance/1895703 new file mode 100644 index 00000000..05a014c3 --- /dev/null +++ b/results/classifier/118/performance/1895703 @@ -0,0 +1,85 @@ +performance: 0.981 +permissions: 0.891 +TCG: 0.883 +graphic: 0.714 +device: 0.548 +architecture: 0.476 +PID: 0.342 +semantic: 0.335 +peripherals: 0.320 +mistranslation: 0.224 +KVM: 0.215 +ppc: 0.199 +risc-v: 0.178 +boot: 0.177 +hypervisor: 0.167 +network: 0.160 +user-level: 0.149 +kernel: 0.148 +debug: 0.146 +VMM: 0.141 +vnc: 0.136 +arm: 0.117 +register: 0.115 +x86: 0.113 +files: 0.108 +socket: 0.104 +i386: 0.093 +virtual: 0.049 +assembly: 0.037 + +performance degradation in tcg since Meson switch + +The buildsys conversion to Meson (1d806cef0e3..7fd51e68c34) +introduced a degradation in performance in some TCG targets: + +-------------------------------------------------------- +Test Program: matmult_double +-------------------------------------------------------- +Target Instructions Previous Latest + 1d806cef 7fd51e68 +---------- -------------------- ---------- ---------- +alpha 3 233 957 639 ----- +7.472% +m68k 3 919 110 506 ----- +18.433% +-------------------------------------------------------- + +Original report from Ahmed Karaman with further testing done +by Aleksandar Markovic: +https://<email address hidden>/msg740279.html + +Can I get a sample statically linked m68k binary that exhibits this effect? + + + +I get + +$ qemu-m68k ./matmult_double-m68k +Error while loading /home/pbonzini/matmult_double-m68k: Permission denied + + +Paolo: what are the permissions on matmult_double-m68k on your local fs? (needs to be readable/executable by you) + + +Uff, of course... + +This patch shold fix the regression: + +diff --git a/configure b/configure +index 0004c46525..0786144043 100755 +--- a/configure ++++ b/configure +@@ -7414,6 +7414,7 @@ NINJA=${ninja:-$PWD/ninjatool} $meson setup \ + -Dwerror=$(if test "$werror" = yes; then echo true; else echo false; fi) \ + -Dstrip=$(if test "$strip_opt" = yes; then echo true; else echo false; fi) \ + -Db_pie=$(if test "$pie" = yes; then echo true; else echo false; fi) \ ++ -Db_staticpic=$(if test "$pie" = yes; then echo true; else echo false; fi) \ + -Db_coverage=$(if test "$gcov" = yes; then echo true; else echo false; fi) \ + -Dmalloc=$malloc -Dmalloc_trim=$malloc_trim -Dsparse=$sparse \ + -Dkvm=$kvm -Dhax=$hax -Dwhpx=$whpx -Dhvf=$hvf \ + + +This was fixed initially by commit 0c3dd50eaecbfe2, which is the change suggested in Paolo's comment #6, and then refined by commit a5cb7c5afe717d4. + + +Released with QEMU v5.2.0. + |