On Thu, 2007-02-15 at 18:29 +0200, Michael S. Tsirkin wrote: > > Quoting Doug Ledford <[EMAIL PROTECTED]>: > > Subject: Re: 32-bit build for ppc64 is required > > > > On Thu, 2007-02-15 at 07:57 +0200, Michael S. Tsirkin wrote: > > > > > > The choice of 32/64 bit default is done on a per arch basis. With > > > > x86_64/i386, the increased number of CPU registers in 64bit mode > > > > outweighs the increased code bloat that goes along with 64bit mode. On > > > > PPC, no such register benefit exists for 64bit mode. As such, 32bit > > > > apps on PPC are faster than the equivalent 64bit apps up to the point at > > > > which a 4GB address space becomes a problem. Correspondingly, the > > > > default binaries on PPC are 32bit, and only those that *need* to be > > > > 64bit are. While a customer's application may need >4GB address space, > > > > certainly all the ibutils, diags, opensm, etc. do not. As a result, we > > > > compile all of those utilities as 32bit by default on PPC. We also ship > > > > all the libs as both 32/64bit so users can select the appropriate > > > > environment for their particular application (with the exception of > > > > dapl, which doesn't support 32bit and for which I filed a bug around the > > > > time of OFED 1.1). > > > > > > So, what you suggest is - build 2 types of libraries, but on PPC make > > > binaries 32 bit? That's easy - do others agree to this approach? > > > > Yep, that's what we do. > > Care to post a patch to Vlad's scripts?
Yuk. I suppose I could write one, but I don't (and can't) use any of
the OFED supplied build scripts in our build system, so it's hard for me
to test since our build system is the only way I have to access
ppc/ppc64 hardware.
--
Doug Ledford <[EMAIL PROTECTED]>
GPG KeyID: CFBFF194
http://people.redhat.com/dledford
Infiniband specific RPMs available at
http://people.redhat.com/dledford/Infiniband
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