>> Do you mean http://www.freebsd.org/cgi/query-pr.cgi?pr=84903 or sth >> else? > yes, this I patched my kernel as described but It has no any effect on untarring performance. Anyway thank you for your hint, I belive this can help in tuning other things. # time gtar -xf mysql-m.tgz 1.207u 16.371s 7:01.06 4.1% 164+278k 8030+7176io 4pf+0w JG