[CentOS-virt] 32bit host and guest, TLS

Host and guest are both CentOS 5.3 32 bit. When I populate the root partition of the guest I noticed that the tls directory is empty. I installed the Base package only. However, in my host machine I have these two files

/usr/lib/tls /usr/lib/perl5/5.8.8/i386-linux-thread-multi/asm/ioctls.ph /usr/lib/perl5/5.8.8/i386-linux-thread-multi/bits/ioctls.ph

Not having TLS in the guest, is this normal? Is it still important to mv the tls in the host? Excuse me, but what is this TLS issue all about?