> -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Dan Williams > Sent: Saturday, May 16, 2015 10:22 PM > To: Elliott, Robert (Server Storage) > Cc: [email protected]; Neil Brown; Greg KH; Dave Chinner; linux- > [email protected]; Andy Lutomirski; Jens Axboe; H. Peter Anvin; > Christoph Hellwig; Ingo Molnar > Subject: Re: [Linux-nvdimm] [PATCH v2 19/20] nd_btt: atomic sector > updates > > On Sat, May 16, 2015 at 6:19 PM, Elliott, Robert (Server Storage) > <[email protected]> wrote: > > ... > 2 items to check: > > 1/ make sure you have a your btt sector size set to 4k which cuts down > the overhead by a factor of 8. > > 2/ boot with nr_cpus=256 or lower. > > Ross noticed that CONFIG_NR_CPUS is set quite high on distro kernels > which revealed that we should have been using nr_cpu_ids and percpu > variables for nd_region_acquire_lane() from the outset. This fix is > coming in v3.
My system does have CONFIG_NR_CPUS=8192. I'll try the items you suggested.
