On Wednesday, February 22, 2012 9:59:02 pm Doug Barton wrote: > On 02/22/2012 01:42, Ivan Voras wrote: > > The Dragonfly team has recently liberated their VM from the giant lock and > > there are some interesting benchmarks comparing it to FreeBSD 9 and a derivative of RedHat Enterprise Linux: > > > > http://leaf.dragonflybsd.org/mailarchive/kernel/2011-11/msg00008.html > > > > Other developments are described in their release notes: > > http://www.dragonflybsd.org/release30/ > > The 4.5 times improvement by enabling kern.ipc.shm_use_phys is pretty > notable, what prevents us from enabling that by default?
It makes all your SYSV SHMs wired. That's fine if you are running a dedicated server using SYSV SHMs where you want that process to use all the RAM in the machine (e.g. a pgqsl server). It's not so great for a general purpose load where you would like an otherwise-idle process using SYSV SHMs to have the SHMs paged out to swap if other processes on the machine need memory and the box is under memory pressure. -- John Baldwin _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
