[Bug 853969] Re: slow memmove/memcpy on new CPUs

[Matthias Klose]

yes, basically the --enable-multiarch glibc configure option was
disabled for natty. It's now re-enabled in oneiric. Please re-open i you
still see regressions.


** Changed in: eglibc (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/853969

Title:
  slow memmove/memcpy on new CPUs

Status in “eglibc” package in Ubuntu:
  Fix Released

Bug description:
  Memmove and memcpy operations in lic6 and libc6-dev packages are very slow on new CPUs (Intel i5, ...).
  It's possible to meassure it in the STRING SORT test of nbench benchmark.
  http://www.tux.org/~mayer/linux/bmark.html
  When linked with manually compiled eglibc 2.13 sources, the test is cca 4 times faster.

  Some informations are in my previous "question":
  https://answers.launchpad.net/ubuntu/+source/eglibc/+question/171345

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: libc6 2.13-0ubuntu13
  Uname: Linux 2.6.38.8-adeos x86_64
  NonfreeKernelModules: rt_e1000_new rt_r8169 rtpacket rtnet
  Architecture: amd64
  Date: Mon Sep 19 17:46:27 2011
  InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
  ProcEnviron:
   LANGUAGE=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: eglibc
  UpgradeStatus: No upgrade log present (probably fresh install)

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