September 7, 2025 at 10:21 PM, "BALATON Zoltan" wrote: > I have uploaded some PPC binaries for the STREAM benchmark that I tested with > before here: > http://zero.eik.bme.hu/~balaton/qemu/stream-test.zip > which may excercise this if run on sam460ex or ppce500 machines but I don't > have a scripted test case for that. There is some docs on how to run Linux on > these machines here: > https://www.qemu.org/docs/master/system/target-ppc.html
After spending too much time looking for usable root-images (and then giving up and just stuffing the executables in an ext2), I got to run these beanchmarks on Linux 4.4.5 configured for the Sam460ex from [1]. I ran streamPPCpowerpcO3 on qemu with these patches: ------------------------------------------------------------- Function Best Rate MB/s Avg time Min time Max time Copy: 2867.6 0.056828 0.055795 0.061792 Scale: 1057.5 0.153282 0.151305 0.158115 Add: 1308.8 0.187095 0.183380 0.193672 Triad: 1111.6 0.220863 0.215902 0.230440 ------------------------------------------------------------- After doing a clean build, with the fans still audible: ------------------------------------------------------------- Function Best Rate MB/s Avg time Min time Max time Copy: 2932.9 0.055131 0.054554 0.055667 Scale: 1067.9 0.151520 0.149832 0.155000 Add: 1324.9 0.184807 0.181150 0.191386 Triad: 1122.0 0.220080 0.213896 0.229302 ------------------------------------------------------------- On qemu (6a9fa5ef3230a7d51e0d953a59ee9ef10af705b8) without these patches, but plugins enabled: ------------------------------------------------------------- Function Best Rate MB/s Avg time Min time Max time Copy: 2972.1 0.054407 0.053834 0.054675 Scale: 1068.6 0.151503 0.149726 0.154594 Add: 1327.6 0.185160 0.180784 0.193181 Triad: 1127.2 0.219249 0.212915 0.229230 ------------------------------------------------------------- And on qemu (6a9fa5ef3230a7d51e0d953a59ee9ef10af705b8) without these patches, with plugins disabled: ------------------------------------------------------------- Function Best Rate MB/s Avg time Min time Max time Copy: 2983.4 0.055141 0.053630 0.060013 Scale: 1058.3 0.152353 0.151186 0.155072 Add: 1323.9 0.184707 0.181279 0.188868 Triad: 1128.2 0.218674 0.212734 0.230314 ------------------------------------------------------------- I fail to see any significant indication that these patches, or plugins in general, would result in a degredation of performance. Regards, Julian [1]: http://www.supertuxkart-amiga.de/amiga/sam.html#downloads
