Cdrecord warnings

[Fabio Comolli]

Hi list.
Burning CDs or blanking CD-RWs as root user gives no warnings; as
normal user always gives:

cdrecord: Cannot allocate memory. WARNING: Cannot do mlockall(2).
cdrecord: WARNING: This causes a high risk for buffer underruns.
cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
cdrecord: WARNING: This causes a high risk for buffer underruns.

This happens either running cdrecord directly or through k3b. So far I
got no toasters: should I consider this warnings harmless?

Thanks,
Fabio