On Wednesday 10 June 2009 6:02:12 am Dag-Erling Smørgrav wrote: > Kip Macy <km...@freebsd.org> writes: > > Dmitry Morozovsky <ma...@rinet.ru> writes: > > > Hmm, I failed to see how boolean prevent the usage: > > > > > > if arch==i386 || memsize < 4G > > > zfs_prefetch=0 > > > else > > > zfs_prefetch=1 > > > > > > and admin can flip the switch to non-default position. > > > > > Right, what you're advocating is zfs_prefetch_non_default. Which is > > simpler, but still rather weird. > > No, he's advocating zfs_prefetch_enable which is initialized to either 0 > or 1 at boot time and can be administratively set to either 0 and 1 > regardless of its initial value. I don't see the problem...
Yes, you can simply do a TUNABLE_INT_FETCH() after the initial calculation to honor any user override. Many existing settings already work this way where the user can override the auto-tuned value (e.g. all the buffer-cache tuning settings). -- John Baldwin _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
