[Xen-users] Xen and TLS, -mno-tls-direct-seg-refs needed?

[Sven Köhler <skoehler@xxxxxx>]

Hi,

The Gentoo-Wiki about Xen suggests, to add "-mno-tls-direct-seg-refs" to
CFLAGS and to recompile the whole system. So it seems, NPTL will work
without problems (and without performance drawback) after that.

Sweet!

But i carefully read http://wiki.xensource.com/xenwiki/XenSpecificGlibc,
and it says:

"On 32-bit x86 platforms, Xen uses segmentation to provide protection of
the memory used for the hypervisor. This results in some performance
issues since wrap-around segments as used by glibc need expensive extra
handling. For more information on how Xen uses segmentation, see
XenSegments."

On 32-bit platforms?

Does it mean, that i don't need to use that "-mno-tls-direct-seg-refs"
on 64-Bit platforms?


That's actually all i'm concerned about.


Thanks,
  Sven

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