diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2021-04-30 05:58:59 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-05-03 05:08:22 -0700 |
| commit | cf2c57526ba4b57e6863ad4db8a868e2678adce8 (patch) | |
| tree | bf6a69a19ea3df3d4e905c73298dbbee74559ebe /sysdeps/unix/sysv/linux/tst-timerfd.c | |
| parent | 98544f5bcf1bef9311463ded60ddd3941c75a547 (diff) | |
| download | glibc-cf2c57526ba4b57e6863ad4db8a868e2678adce8.zip glibc-cf2c57526ba4b57e6863ad4db8a868e2678adce8.tar.gz glibc-cf2c57526ba4b57e6863ad4db8a868e2678adce8.tar.bz2 | |
x86: Set rep_movsb_threshold to 2112 on processors with FSRM
The glibc memcpy benchmark on Intel Core i7-1065G7 (Ice Lake) showed
that REP MOVSB became faster after 2112 bytes:
Vector Move REP MOVSB
length=2112, align1=0, align2=0: 24.20 24.40
length=2112, align1=1, align2=0: 26.07 23.13
length=2112, align1=0, align2=1: 27.18 28.13
length=2112, align1=1, align2=1: 26.23 25.16
length=2176, align1=0, align2=0: 23.18 22.52
length=2176, align1=2, align2=0: 25.45 22.52
length=2176, align1=0, align2=2: 27.14 27.82
length=2176, align1=2, align2=2: 22.73 25.56
length=2240, align1=0, align2=0: 24.62 24.25
length=2240, align1=3, align2=0: 29.77 27.15
length=2240, align1=0, align2=3: 35.55 29.93
length=2240, align1=3, align2=3: 34.49 25.15
length=2304, align1=0, align2=0: 34.75 26.64
length=2304, align1=4, align2=0: 32.09 22.63
length=2304, align1=0, align2=4: 28.43 31.24
Use REP MOVSB for data size > 2112 bytes in memcpy on processors with
fast short REP MOVSB (FSRM).
* sysdeps/x86/dl-cacheinfo.h (dl_init_cacheinfo): Set
rep_movsb_threshold to 2112 on processors with fast short REP
MOVSB (FSRM).
Diffstat (limited to 'sysdeps/unix/sysv/linux/tst-timerfd.c')
0 files changed, 0 insertions, 0 deletions