On 14 Feb 2010, at 20:26, Jonathan Belson wrote: > On 14 Feb 2010, at 19:13, Artem Belevich wrote: >> Can you check if kstat.zfs.misc.arcstats.memory_throttle_count sysctl >> increments during your tests? >> >> ZFS self-throttles writes if it thinks system is running low on >> memory. Unfortunately on FreeBSD the 'free' list is a *very* >> conservative indication of available memory so ZFS often starts >> throttling before it's really needed. With only 2GB in the system, >> that's probably what slows you down. > > I tested a number of times during a 2GB write to a zfs partition and the > count stayed at 0.
Oh, I should add that I use the following settings from the zfs tuning guide: vm.kmem_size="1024M" vm.kmem_size_max="1024M" vfs.zfs.arc_max="100M" Cheers, --Jon _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
