On 2010-Dec-30 02:31:30 -0500, Adam Stylinski <[email protected]> wrote: >I can tell you what the problem is right now, actually. ZFS performs >very poorly on low performance CPUs (i.e. your Atom N330).
I would disagree. In this case, the op's most serious problem is a bug in sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c:arc_memory_throttle() which is leading to ARC starvation. The direct effect of this is very poor ZFS I/O performance. It can be identified by very high "inactive" and possibly "cache" memory (as reported by 'systat -v' or top) as well as very high kstat.zfs.misc.arcstats.memory_throttle_count This bug was fixed in r210427 on -current, r211599 on 8.x and r211623 on 7.x. > Try the >same system with a different CPU and you'll get a different result. Not until the above bug is fixed. That said, ZFS is far more CPU intensive than UFS and a more powerful CPU may help - especially if you want gzip compression and/or sha256 checksumming. -- Peter Jeremy
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