We looked at machine with Ubuntu 11.04 on it. And it looks like
__memset_sse2 is not really avalaible in a dump of the glibc at
/lib/x86_64-linux-gnu/libc.so.6. Nor is __memcpy_ssse3 avalaible. In
fact, none of the symbols with _sse* suffix are avalaible. Does Ubuntu
use glibc or eglibc? If glibc is used, is it built with --enable-
multiarch. Without the *_sse* routines, we expect glibc performance to
be quite hindered on both AMD Barcelona (Greyhound core) and AMD Orochi
(Bulldozer core) machines.

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https://bugs.launchpad.net/bugs/735020

Title:
  Ubuntu 11.04: Support AMD Bulldozer processor - glibc (memset)

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