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Xen 3.0 Virtualization User Guide
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2.5.3 TLS Libraries

Users of the XenLinux 2.6 kernel should disable Thread Local Storage (TLS) (e.g. by doing a mv /lib/tls /lib/tls.disabled) before attempting to boot a XenLinux kernel2.4. You can always reenable TLS by restoring the directory to its original location (i.e. mv /lib/tls.disabled /lib/tls).

The reason for this is that the current TLS implementation uses segmentation in a way that is not permissible under Xen. If TLS is not disabled, an emulation mode is used within Xen which reduces performance substantially. To ensure full performance you should install a `Xen-friendly' (nosegneg) version of the library.

Xen 3.0 Virtualization User Guide
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