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x86: Remove the default REP MOVSB threshold tunable value [BZ #27061]

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Since we can't tell if the tunable value is set by user or not:

https://sourceware.org/bugzilla/show_bug.cgi?id=27069

remove the default REP MOVSB threshold tunable value so that the correct
default value will be set correctly by init_cacheinfo ().

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
H.J. Lu 2020-12-13 04:56:41 -08:00
parent 5a96fe2e02
commit 2ee7711bdd
1 changed files with 4 additions and 2 deletions
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6
sysdeps/x86/dl-tunables.list
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@ -39,9 +39,11 @@ glibc {
# REP MOVSB. Since larger register size can move more data with a # REP MOVSB. Since larger register size can move more data with a
# single load and store, the threshold is higher with larger register # single load and store, the threshold is higher with larger register
# size. Note: Since the REP MOVSB threshold must be greater than 8 # size. Note: Since the REP MOVSB threshold must be greater than 8
# times of vector size, the minium value must be updated at run-time. # times of vector size and the default value is 2048 * (vector size
# / 16), the default value and the minimum value must be updated at
# run-time. NB: Don't set the default value since we can't tell if
# the tunable value is set by user or not [BZ #27069].
minval: 1 minval: 1
default: 2048
} }
x86_rep_stosb_threshold { x86_rep_stosb_threshold {
type: SIZE_T type: SIZE_T