Some more results: = Raspberry Pi 3B 1GB =
length | before (MiB/s) | after (MiB/s) | delta ----------|----------------|----------------|---------- 32768 | 48.24 | 46.19 | -4.26% 65536 | 85.99 | 79.96 | -7.02% 131072 | 154.00 | 139.68 | -9.30% 262144 | 178.72 | 164.12 | -8.17% 524288 | 163.56 | 156.55 | -4.28% 1048576 | 246.15 | 234.32 | -4.81% = Raspberry Pi 3A+ 512MB = length | before (MiB/s) | after (MiB/s) | delta ----------|----------------|----------------|---------- 32768 | 57.11 | 54.22 | -5.06% 65536 | 101.16 | 94.53 | -6.56% 131072 | 186.94 | 168.37 | -9.94% 262144 | 200.16 | 181.37 | -9.39% 524288 | 175.91 | 168.93 | -3.97% 1048576 | 261.19 | 250.62 | -4.04% = Raspberry Pi Zero 2 = length | before (MiB/s) | after (MiB/s) | delta ----------|----------------|----------------|---------- 32768 | 40.58 | 38.75 | -4.51% 65536 | 72.51 | 67.57 | -6.81% 131072 | 132.02 | 121.20 | -8.20% 262144 | 165.26 | 149.13 | -9.76% 524288 | 160.46 | 153.15 | -4.55% 1048576 | 241.92 | 230.87 | -4.57% Worth noting that the Pi 4 uses the 2711 SoC, while these (the 3B, 3A+, and Zero 2) all use the older 2837 SoC. In other words, while the new memcpy seems "okay" on the 2711, it's got "some" performance regression on the 2837. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1951032 Title: AArch64: Backport memcpy improvements To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1951032/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs