Oracle Linux timing

Hi,

in SQLPLUS you can 'set timing on' and you get elapsed time of every command.

On

Oracle 8.1.6, Suse 7.0 SMP 2.2.16 on a dual Pentium and a
Oracle 8.1.6, Suse 6.4 SMP 2.2.14 on a dual Pentium and 
Oracle 8.1.7, Suse 7.0 single Pentium 2.2.16

the given time is 1.66 times higher than the real elapsed time.

Runs OK on
Oracle 7.3.3 on Irix 6.2
Oracle 7.3.3 on AIX 3.2.5

Anybody sees this on Linux too?
Any ideas?

regards,

Toni

PS: What i did:

   sqlplus

      set timing on
      create table ttt as select * from <any_table>;
      insert into ttt select * from ttt;
      insert into ttt select * from ttt;
      insert into ttt select * from ttt;


      ... as long as you want to measure every time comparing 

      ... elapsed time with hand stopped time.

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