4.1. A large warning message is displayed when I boot Linux, saying something about '/lib/tls'. What should I do?
Do as the message advises! Some modern distributions ship with a 'TLS' version of glibc that is not fully compatible with Xen. To use Xen reliably and with maximum performance you must disable the incompatible glibc. You can easily do this by moving the /lib/tls directory (e.g., mv /lib/tls /lib/tls.disabled). Alternatively, install a Xen-specific GLIBC, see XenSpecificGlibc.