Ian Collins writes: > Roch Bourbonnais wrote: > > > > with recent bits ZFS compression is now handled concurrently with many > > CPUs working on different records. > > So this load will burn more CPUs and acheive it's results > > (compression) faster. > > > Would changing (selecting a smaller) filesystem record size have any effect? >
If the problem is that we just have a high kernel load compressing blocks, then probably not. If anything small records might be a tad less efficient (thus needing more CPU). > > So the observed pauses should be consistent with that of a load > > generating high system time. > > The assumption is that compression now goes faster than when is was > > single threaded. > > > > Is this undesirable ? We might seek a way to slow down compression in > > order to limit the system load. > > > I think you should, otherwise we have a performance throttle that scales > with the number of cores! > Again I wonder to what extent the issue becomes painful due to lack of write throttling. Once we have that in, we should revisit this. -r > Ian > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
