RE: [Linux-ia64] page size > 16KB

["Seth, Rohit" <rohit.seth@intel.com>]

The HugeTLB page documentation with 2.5.64 is most uptodate.  The
default setting on SLES8 uses 16MB hugepage size.

> -----Original Message-----
> From: Jesse Barnes [mailto:jbarnes@sgi.com] 
> Sent: Friday, March 14, 2003 9:34 AM
> To: Jan Schreckenbach
> Cc: linux-ia64@linuxia64.org
> Subject: Re: [Linux-ia64] page size > 16KB
> 
> 
> On Fri, Mar 14, 2003 at 01:33:12PM +0100, Jan Schreckenbach wrote:
> > yep, I'm doing some benchmark stuff with SAP/SAPDB and the 
> performance 
> > is not as good as I expected. CONFIG_HUGETLB_PAGE=y is 
> standard on a 
> > SLES8 kernel (2.4.19-SMP). I changed the page size from 16K 
> to 64K and 
> > the performance increase was 2-3 percent. Changing  Huge TLB Page 
> > Size" seems not to have any effect.
> 
> Are you using the huge TLB support (it's not transparent to 
> the app). If you're  seeing a few percent going from 16k to 
> 64k, I'd expect that you'd see a bigger gain going from 16k 
> to using the huge tlb api.  See 
> Documentation/vm/hugetlbpage.txt in the kernel source for an 
> idea of how to make use it (not sure if the doc is up to 
> date, haven't used it myself).
> 
> Jesse
> 
> _______________________________________________
> Linux-IA64 mailing list
> Linux-IA64@linuxia64.org 
> http://lists.linuxia64.org/lists/listinfo/linu> x-ia64
>