On Wed, Feb 22, 2012 at 7:59 PM, Doug Barton <do...@freebsd.org> 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? > > > Doug > > -- I just saw this, so I thought I would mention -- DragonFly was not doing a great job allocating pv entries rapidly, which is needed during PostgreSQL warm up -- This made shm_use_phys appear very effective. It only makes 1-2% difference now on DragonFly, and only 1-2% difference on FreeBSD. Sam _______________________________________________ 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"
