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Changing Page Size

 
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Jim Hintze
Advisor

Changing Page Size

While fully understanding that OpenVMS can not understand any page size other than 8192, How does one change the page size to a value other than 8192. Alpha ES45/ES40 answers are also welcome.

thanks
Jim
7 REPLIES 7
Jozef_Novak
Respected Contributor

Re: Changing Page Size

Hi Jim,

this is a question for OpenVMS forums, I believe.

J.
Jim Hintze
Advisor

Re: Changing Page Size


Sorry I wasn't clear on the first post. this is an operating system independant question.

on either integrity (2660, 6600, 8640) or alpha (es40/es45), how does one change the page size?

thnaks
Jim
Torsten.
Acclaimed Contributor
Solution

Re: Changing Page Size

Isn't it a kernel related setting?

From my hp-ux box:

# getconf PAGESIZE
4096

# kmtune -q vps_pagesize
Parameter Current Dyn Planned Module Version
===============================================================================
vps_pagesize 4 - 4


So it is not hardware related ;-))

See also (for hp-ux):

http://docs.hp.com/en/B3921-90010/vps_pagesize.5.html

Hope this helps!
Regards
Torsten.

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Jim Hintze
Advisor

Re: Changing Page Size


OK, conflicting info from another forum.
spot on, Thanks.

Andrew C Fieldsend
Respected Contributor

Re: Changing Page Size

The processor's Translation Lookaside Buffer (TLB) implementation defines the allowable values for the page size (see the relevant processor documentation for the details), but the operating system memory management code determines which values are actually used.

Actually, OpenVMS can understand other page sizes than 8k, but 8k is the default. See section 12.1 of the OpenVMS Programming Concepts Manual at http://www.openvms.compaq.com/doc/82final/5841/5841pro_038.html.

So it's both a hardware and operating system question;-)
Jim Hintze
Advisor

Re: Changing Page Size


looking in circles here??

BOO$GQ_PAGE_SIZE = .HWRPB[HWRPB$IL_PAGESIZE_L];

MMG$GL_PAGE_SIZE is filled from BOO$GQ_PAGE_SIZE

while VMS may have the capacity to understand different values for BOO$GQ_PAGE_SIZE, Do I have the opportunity to set it anywhere??
Andrew C Fieldsend
Respected Contributor

Re: Changing Page Size

After some searching, I've found that the page size is set from the HWRPB (as you pointed out). The HWRPB is set up by the boot firmware, so if it is modifiable this will be the only place to do it - though I suspect it will be hardcoded in the firmware for each system, as it needs to be configured early in the boot process.