DISABLE THREAD_TLS

[Ming-Ching Tiew]

I am trying to compile freeradius on uclibc, it complains of undefined symbol
 __tls_get_addr. So I went to modify src/include/autoconf.h, and commented
#define HAVE_THREAD_TLS 1, then the compilation was successful. My question is 
what do I missed from disabling THREAD_TLS ? Does it mean performance impact ?
Will it mean freeradius will be slower, consuming more memory or what ?

Regards.