lkml.org 
[lkml]   [2015]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRE: [Linux-nvdimm] [PATCH v2 19/20] nd_btt: atomic sector updates
    Date


    > -----Original Message-----
    > From: dan.j.williams@gmail.com [mailto:dan.j.williams@gmail.com] On
    > Behalf Of Dan Williams
    > Sent: Saturday, May 16, 2015 10:22 PM
    > To: Elliott, Robert (Server Storage)
    > Cc: linux-nvdimm@lists.01.org; Neil Brown; Greg KH; Dave Chinner; linux-
    > kernel@vger.kernel.org; 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)
    > <Elliott@hp.com> 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.


    \
     
     \ /
      Last update: 2015-05-20 19:41    [W:4.288 / U:0.980 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site