Messages in this thread | | | Date | Thu, 19 May 2011 22:02:33 -0500 | From | Kazutomo Yoshii <> | Subject | Re: [bg-linux] [PATCH 5/7] [RFC] force 32-byte aligned kmallocs |
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On 05/19/2011 09:13 PM, Benjamin Herrenschmidt wrote: > On Fri, 2011-05-20 at 12:08 +1000, Benjamin Herrenschmidt wrote: > >> On Thu, 2011-05-19 at 20:32 -0500, Kazutomo Yoshii wrote: >> >>> Actually DMA sends invalidate requests to the snoop unit(L2 level). >>> BGP SoC is a bit different from other 4xx base. >>> >> Well, some other 44x also have a snooping L2 (more or less), but L1 is >> usually the problem. >> > Hrm... looking at the doco you pointed me to, it looks like the L1 -is- > coherent, it gets snoop kills from the L2. > Right, L1D is coherent if write throug is set. L1I(virtually tagged) is not coherent, btw.
> Ok so we do need to make this non-coherent cache stuff a runtime option > (well, we need that for 440+476 too anyways so may as well do it now). > What sort of runtime option do you mean?
- kaz > As for the alignment of kmalloc, it looks like a hack that should be > done in the torus code itself. > > Cheers, > Ben. > > _______________________________________________ > bg-linux mailing list > bg-linux@lists.anl-external.org > https://lists.anl-external.org/mailman/listinfo/bg-linux > http://bg-linux.anl-external.org/wiki >
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