xen-users
Re: [Xen-users] /lib/tls.disabled does not work
Ralf Schmitt wrote:
Hi,
a new initrd will not help. Have a look a this:
***************************************************************
***************************************************************
** WARNING: Currently emulating unsupported memory accesses **
** in /lib/tls glibc libraries. The emulation is **
** slow. To ensure full performance you should **
** install a 'xen-friendly' (nosegneg) version of **
** the library, or disable tls support by executing **
** the following as root: **
** mv /lib/tls /lib/tls.disabled **
** Offending process: hotplug (pid=276) **
***************************************************************
***************************************************************
This message comes from "hotplug" ... so I have to compile hotplug
without tls support to get rid of this boot message.
Move /lib/tls to /ib/tls.disabled and ignore these messages.
-ralf-
Every package built without -mno-tls-direct-seg-refs has this problem,
including Glibc.
Gentoo chooses to rebuild the whole tree to get rid of this problem.
Taken from Gentoo Wiki:
"Some software, in particular the glibc TLS library, performs poorly
whilst carrying
out certain operations under Xen. This will result in a ~50% performance
penalty
running multi-threaded applications. To fix this, you must compile your
system with
the '-mno-tls-direct-seg-refs' flag. Rebuild every package with your new
CFLAGS."
Gentoo also choose to use Glibc with NPTL only, without Linuxthread.
This eliminates
the use of directory /lib/tls.
William Zhou
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