Den 2021-04-02 kl. 17:05, skrev Borislav Petkov: > On Fri, Apr 02, 2021 at 10:33:51AM +0200, Paul Menzel wrote: >> Dear Linux folks, >> >> >> On an two socket AMD EPYC 7601, we noticed a decrease in raid6 avx2x4 speed >> shown at the beginning of the boot. >> >> 5.4.95 5.10.24 >> ---------------------------------------------- >> raid6: avx2x4 gen() 18429 MB/s 6155 MB/s >> raid6: avx2x4 xor() 6644 MB/s 4274 MB/s >> raid6: avx2x2 gen() 17894 MB/s 18744 MB/s >> raid6: avx2x2 xor() 11642 MB/s 11950 MB/s >> raid6: avx2x1 gen() 13992 MB/s 17112 MB/s >> raid6: avx2x1 xor() 10855 MB/s 11143 MB/s > > Looks like those two might help: > That would mean only this is missing: > 49200d17d27d x86/fpu/64: Don't FNINIT in kernel_fpu_begin() as this one landed in 5.10.11: > e45122893a98 x86/fpu: Add kernel_fpu_begin_mask() to selectively initialize state > -- Thomas
