On Thu, 26 Dec 2013 03:24:00 -0600 Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote: > On 12/26/2013 2:55 AM, Christoph Hellwig wrote: > > On Sat, Dec 21, 2013 at 05:18:42AM -0600, Stan Hoeppner wrote: > >> The powers that be, Linus in particular, are not fond of default > >> settings that create a lot of kernel memory structures. The default > >> md-RAID5/6 stripe_cache-size yields 1MB consumed per member device. > > > > The default sizing is stupid as it basically makes RAID unusable out > > of the box, I always have to fix that up, as well as a somewhat > > reasonable chunk size for parity RAID to make it usable. I'm also > > pretty sure I complained about it at least once a while ago, but never > > got a reply. > > IIRC you Dave C. and myself all voiced criticism after the default chunk > size was changed from 64KB to 512KB. I guess we didn't make a strong > enough case to have it reduced, or maybe didn't use the right approach. > > Maybe Neil is waiting for patches to be submitted for changing these > defaults, and to argue the merits in that context instead of pure > discussion? Dunno. Just guessing. Maybe he'll read this and jump in. > Good guess. NeilBrown
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