Expensive log_line_prefix ? - Mailing list pgsql-general

In 9.1.x

Are there any "extra" costs to logging all this cool stuff ?

     log_line_prefix = '%m %a %u %p %c %m %v %x'

Are any of these expensive ?

Or is the only cost the number of bytes that the textual representation of their values take in the written log file ?

Thanks,

-dvs-