Matthew Allen wrote:
I have an application that is suffering from high iTLB misses and I'd really
like to enable VMPSS. I can create a binary with the text segment aligned on a
4M boundary, but the text is still mapped to 8K pages (as reported by pmap -xs).
Is there anything I need to do to enable large page support in Solaris Express?
My understanding is that it is enabled by default, but I can't seem to get my
application to take advantage of it.
Aligning text on a 4M boundary isn't sufficient. We need a new mapfile
option to specify you want to round up the size of the segment to 4M for
VMPSS to work.
I recommend filing an RFE for this against the linker
(cat compiler / subcat linker). You can do that here:
https://www.opensolaris.org/bug/report.jspa
With underlying mapfile support in the linker to do this, -xpagesize=XXXX
in the C compiler could also be extended to support this.
We're also looking into other options to make this transparent on 64-bit
target binaries but in all cases the linker has to be involved since we're
dealing with ELF.
- Eric
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