On Wed, Oct 03, 2007 at 04:31:01PM +0200, Roch - PAE wrote: > > It does, which leads to the core problem. Why do we have to store the > > exact same data twice in memory (i.e., once in the ARC, and once in > > the shared memory segment that Oracle uses)? > > We do not retain 2 copies of the same data. > > If the DB cache is made large enough to consume most of memory, > the ZFS copy will quickly be evicted to stage other I/Os on > their way to the DB cache. > > What problem does that pose ?
Other things deserving of staying in the cache get pushed out by things that don't deserve being in the cache. Thus systemic memory pressure (e.g., more on-demand paging of text). Nico -- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
