I notice that your cpu flags list avx2; this suggests the possibility
that the code path being used is one that's specific to avx2, not just
sse2. I have attempted to reproduce this on CPUs both with and without
avx2 and I cannot. I get no statistically-significant difference in
runtime, on either the avx2 system or the non-avx2 system, with glibc
from Ubuntu 16.04 vs. glibc from Ubuntu 18.04.
This could be a CPU bug or a bug in vagrant rather than in glibc;
there's currently not enough information to tell. I think we would need
a trace that shows which implementation is being selected in glibc in
this environment first and foremost, to confirm whether it's the correct
one.
** Changed in: glibc (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1797335
Title:
strstr() on ubuntu18.04 8 times slower than on ubuntu16
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