[Bug 853969] [NEW] slow memmove/memcpy on new CPUs

[Petr Cervenka]

Public bug reported:

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)

** Affects: eglibc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug natty

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

Title:
  slow memmove/memcpy on new CPUs

Status in “eglibc” package in Ubuntu:
  New

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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