Public bug reported:
On my amazon ec2 machine running 10.04 LTS I find this warning.
[ 37.895954] ***************************************************************
[ 37.895957] ***************************************************************
[ 37.895960] ** WARNING: Currently emulating unsupported memory accesses **
[ 37.895963] ** in /lib/tls glibc libraries. The emulation is **
[ 37.895965] ** slow. To ensure full performance you should **
[ 37.895967] ** install a 'xen-friendly' (nosegneg) version of **
[ 37.895970] ** the library, or disable tls support by executing **
[ 37.895972] ** the following as root: **
[ 37.895974] ** mv /lib/tls /lib/tls.disabled **
[ 37.895977] ** Offending process: convert (pid=871) **
[ 37.895979] ***************************************************************
[ 37.895982] ***************************************************************
[ 37.895984]
When search for similar issues it seems this problem is solved in
earlier versions of ubuntu, but this seems to indicate the opposite.
>From what I read the content of this file should be of some importance
/etc/ld.so.conf.d/xen.conf
And in my machine it contains
# This directive teaches ldconfig to search in nosegneg subdirectories
# and cache the DSOs there with extra bit 1 set in their hwcap match
# fields. In Xen guest kernels, the vDSO tells the dynamic linker to
# search in nosegneg subdirectories and to match this extra hwcap bit
# in the ld.so.cache file.
hwcap 1 nosegneg
ldd /usr/bin/convert gives me
linux-gate.so.1 => (0xb7871000)
libMagickCore.so.2 => /usr/lib/libMagickCore.so.2 (0xb7630000)
libMagickWand.so.2 => /usr/lib/libMagickWand.so.2 (0xb751b000)
liblcms.so.1 => /usr/lib/liblcms.so.1 (0xb74e7000)
libtiff.so.4 => /usr/lib/libtiff.so.4 (0xb748b000)
libc.so.6 => /lib/tls/i686/nosegneg/libc.so.6 (0xb732d000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0xb72b7000)
libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0xb7296000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xb7286000)
libXt.so.6 => /usr/lib/libXt.so.6 (0xb7232000)
libbz2.so.1.0 => /lib/libbz2.so.1.0 (0xb7220000)
libz.so.1 => /lib/libz.so.1 (0xb720b000)
libpthread.so.0 => /lib/tls/i686/nosegneg/libpthread.so.0 (0xb71f2000)
libltdl.so.7 => /usr/lib/libltdl.so.7 (0xb71e9000)
libdl.so.2 => /lib/tls/i686/nosegneg/libdl.so.2 (0xb71e5000)
libSM.so.6 => /usr/lib/libSM.so.6 (0xb71db000)
libICE.so.6 => /usr/lib/libICE.so.6 (0xb71c2000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xb70a5000)
libgomp.so.1 => /usr/lib/libgomp.so.1 (0xb7097000)
libm.so.6 => /lib/tls/i686/nosegneg/libm.so.6 (0xb7071000)
/lib/ld-linux.so.2 (0xb7872000)
libuuid.so.1 => /lib/libuuid.so.1 (0xb706b000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0xb7051000)
librt.so.1 => /lib/tls/i686/nosegneg/librt.so.1 (0xb7048000)
libXau.so.6 => /usr/lib/libXau.so.6 (0xb7044000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0xb703e000)
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/960006
Title:
warning /lib/tls library emulation slow
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