On Mon, Jun 11, 2012 at 09:54:57AM -0500, Stan Hoeppner wrote: > On 6/11/2012 8:29 AM, Carlos Maiolino wrote: > > > The maximum block size of a XFS filesystem is 64kiB. But in linux it's limited > > to the PAGE_SIZE value. > > Correct. > > > so, on x86 architectures, the maximum block size is > > 4kiB. > > Not entirely correct. Since ~1996, 16 years ago, PPro and higher 32bit > CPUs with PSE/PSE36 support pages of 4MB, or 2MB with PAE enabled. > > x86-64 CPUs in long mode also support a 2MB page size. But the problem > of internal fragmentation may outweigh the TLB and other benefits of > these very large pages. I'm not an MM dev so I can't elaborate further. > There may be other issues. > > > although it could benefit from a 16kiB page size, you'll need to be running an > > operating system which supports this page size value. > > And AFAIK the kernel MM team doesn't have x86 2MB pages on their radar. > Or do they? Been supported for a few of years now in one form or another. google for "transparent huge pages"..... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
