Re: [PATCH -V5 00/25] THP support for PPC64

Simon Jeons [off-list ref] writes:

Hi Aneesh,
On 04/04/2013 01:57 PM, Aneesh Kumar K.V wrote:

quoted

Hi,

This patchset adds transparent hugepage support for PPC64.

TODO:
* hash preload support in update_mmu_cache_pmd (we don't do that for hugetlb)

Some numbers:

The latency measurements code from Anton  found at
http://ozlabs.org/~anton/junkcode/latency2001.c

THP disabled 64K page size
------------------------
[root@llmp24l02 ~]# ./latency2001 8G
  8589934592    731.73 cycles    205.77 ns
[root@llmp24l02 ~]# ./latency2001 8G
  8589934592    743.39 cycles    209.05 ns

Could you explain what's the meaning of result?

That is the total memory range, cycles taken to access an address and
time taken to access. That numbers shows the overhead of tlb miss.

you can find the source at http://ozlabs.org/~anton/junkcode/latency2001.c


-aneesh