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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-12-13 04:56:41 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-12-14 07:31:00 -0800 |
| commit | 2ee7711bdd7de9dd30073b223ce29d5cd50320f6 (patch) | |
| tree | c06fc87627b26ba0bad66bfc4947b88839417180 /sysdeps | |
| parent | 5a96fe2e02c740771206a2d96b902e97675daabb (diff) | |
| download | glibc-2ee7711bdd7de9dd30073b223ce29d5cd50320f6.zip glibc-2ee7711bdd7de9dd30073b223ce29d5cd50320f6.tar.gz glibc-2ee7711bdd7de9dd30073b223ce29d5cd50320f6.tar.bz2 | |
x86: Remove the default REP MOVSB threshold tunable value [BZ #27061]
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>
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/x86/dl-tunables.list | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sysdeps/x86/dl-tunables.list b/sysdeps/x86/dl-tunables.list index 1a4a93a..bc26e9f 100644 --- a/sysdeps/x86/dl-tunables.list +++ b/sysdeps/x86/dl-tunables.list @@ -39,9 +39,11 @@ glibc { # REP MOVSB. Since larger register size can move more data with a # single load and store, the threshold is higher with larger register # 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 - default: 2048 } x86_rep_stosb_threshold { type: SIZE_T |