zfs, a directory that used to hold lot of files and listing pause

[Pete French]

> > I've the same issue, but only if the ZFS resides on a LSI MegaRaid and one RAID0 for each disk.
> >
> Not in my case, both pool disks are attached to the Intel ICH7 SATA300 
> controller.

Nor my case - my discs are on this:

ahci0: <Intel 5 Series/3400 Series AHCI SATA controller>