Default value for log_buffer parameter

Using Oracle 10.2.0.1.0 on Solaris 9.
Value for parameter sga_target = 1G. I let the value for parameter log_buffer default.

SQL> show parameter log_buffer

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_buffer                           integer     6203392

SQL> select name, value, isdefault from v$parameter where name = 'log_buffer';

NAME                 VALUE                ISDEFAULT
-------------------- -------------------- ---------
log_buffer           6203392              TRUE

Documentation says that redo log buffer size is controlled manually (not part of automatic sizing) and has a default value of "512 KB or 128 KB * CPU_COUNT, whichever is greater". Machine has 4 CPUs, so log buffer size should be 512 KB. Documentation bug or code bug?

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