I believe Westmere does not have any explicit 1GB page TLB *entries* even
though
it ostensibly supports 1GB pages. Sandy Bridge is the first CPU with 1GB
TLB
entries, but it only has four. Not very helpful for big memory machines.
-tom
On Mon, Jul 9, 2012 at 5:02 PM, Sebastian Kuzminsky <s...@lineratesystems.com
> wrote:
>
>
> On Mon, Jul 9, 2012 at 7:17 AM, Eric B Munson <emun...@mgebm.net> wrote:
>
>>
>> I can't help much with checking the actual hardware support, but we are
>> currently seeing trouble with malloc backed
>> by huge pages. At some point, glibc started ignoring the __morecore hook
>> and I have not yet tracked down the how/why
>> of it. For testing 1GB pages, I recommend you try one of the functions
>> in libhugetlbfs that gives direct access to
>> huge pages (see get_huge_pages()). You can check if it is using a 1GB
>> page by reading /proc/meminfo while the program
>> is active, alternatively there is a helper in our test suite that will
>> read and parse /proc/self/smaps to determine if
>> a given address is mapped to a huge page.
>>
>>
> I get the same results when I use get_huge_pages() to allocate my memory.
> The number of free huge pages in /proc/meminfo goes down while the program
> is running, but the number of dTLB misses is nearly as high as when I use
> 4k pages.
>
> Has anyone successfully used 1 gig pages on this CPU (Intel Xeon E5620)?
> Or any CPU?
>
> Lest I sound like a total neg, 2 meg pages are working well, so yay for
> that ;-)
>
>
>
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