Re: [Xen-users] 64bit processors and TLS warning message

[Molle Bestefich <molle.bestefich@xxxxxxxxx>]

Mark Williamson wrote:
> PAINCHAUD Christophe:
> > I am running an AMD64 Debian system and I noticed that the warning
> > message about /lib/tls like on my other 32bit systems does not appear on
> > this one. Does that mean that AM64 Linux archs aren't TLS enabled ?
>
> It's just not an issue like it is on 32-bit - the TLS implementation doesn't
> conflict with the way Xen enforces protection.

If by "different implementation" you mean that "different TLS
implementations in Xen are used for different hardware architecures",
that makes me wonder:

If I do *not* use -mno-tls-direct-seg-refs or gcc patches on my x86-64
system, will I actually enjoy a performance benefit from the GCC
compiler's TLS optimizations, at least for 32bit userland apps?

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