A quick question: does the Lustre client version 1.8.x and/or 2.x running on RHEL 6 support Transparent Huge Pages? Or do you need to turn that feature off? -- Kent Engstr?m, National Supercomputer Centre kent at nsc.liu.se, +46 13 28 4444
On 2012-05-03, at 8:30 AM, Kent Engstr?m wrote:> A quick question: does the Lustre client version 1.8.x and/or 2.x > running on RHEL 6 support Transparent Huge Pages? Or do you need to turn > that feature off?I don''t know for sure, but you could check the kernel configs we use, in lustre/kernel_patches/kernel_configs/ to see if it is enabled by default. I know I had a discussion about this a couple of years ago, but I don''t recall the outcome. Cheers, Andreas -- Andreas Dilger Whamcloud, Inc. Principal Lustre Engineer http://www.whamcloud.com/
On Sat, May 05, 2012 at 12:07:15AM -0600, Andreas Dilger wrote:> On 2012-05-03, at 8:30 AM, Kent Engstr?m wrote: > > A quick question: does the Lustre client version 1.8.x and/or 2.x > > running on RHEL 6 support Transparent Huge Pages? Or do you need to turn > > that feature off? > > I don''t know for sure, but you could check the kernel configs we use, in lustre/kernel_patches/kernel_configs/ to see if it is enabled by default.AFAIK, transparent huge pages support is enabled by default in the RHEL6 kernel, so we have this feature already enabled on RHEL6 lustre clients. That said, we had to disable page migration (see LU-130) since we need to implement our own page migration handler. Cheers, Johann -- Johann Lombardi Whamcloud, Inc. www.whamcloud.com