On Thu, Jun 06, 2024 at 10:06:42PM -0700, Christoph Hellwig wrote: > On Tue, Jun 04, 2024 at 05:56:36PM -0700, Darrick J. Wong wrote: > > Not much other than the AG[IF] and log grant heads becoming less hot. > > That pushes the bottlenecks to the storage device, which indeed is about > > 8 per device. More if you can raid0 them. > > > > *Fortunately* for metadata workloads the logging code is decent about > > deduplicating repeated updates, so unless you're doing something truly > > nasty like synchronous direct writes to a directory tree with parent > > pointers that is being modified heavily, it takes some effort to > > overload the ssd. > > > > (Or a crappy ssd, I guess. Maybe I'll pull out the 860 QVO and see how > > it does.) > > Ok. I'm also a little worried about creating lots of AGs for tiny > file systems. Then again I've not actually been able to find the code > yet which I should probably look at first. It shouldn't create fewer AGs than what the default algorithm would have calculated, and it won't create AGs smaller than 4GB. --D
