Hi, I'm running current snapshot of OpenBSD on amd64 architecture, MP kernel (Lenovo Thinkpad to be concrete). Based on the official docs tried to tune disk performance by adding `softdep' mounting option for ffs slices.
After updating of /etc/fstab and clean reboot, checked all particular slices like /home, /usr etc. are really mounted with softdep. The issue is about much worse performance then with the default nosoftdep. Now, for example, when extracting ports.tar.gz snapshot in /usr, other process cann't open even small files without very long delays like "vi $HOME/.profile" takes about 2 minutes whereas cpu usage shown with top is about 5% only ! Turning off softdep redeems the access time of the previous example to about 4 seconds. I've searched mailing lists and read about softdep regression on OpenBSD 4.8 that was later fixed. Is this regression back. Does anybody else experiences similar behaviour ?
