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Date: Thu, 19 May 2011 22:02:33 -0500 From: Kazutomo Yoshii <kazutomo@....anl.gov> To: Benjamin Herrenschmidt <benh@...nel.crashing.org> CC: Kazutomo Yoshii <kazutomo.yoshii@...il.com>, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, bg-linux@...ts.anl-external.org Subject: Re: [bg-linux] [PATCH 5/7] [RFC] force 32-byte aligned kmallocs 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@...ts.anl-external.org > https://lists.anl-external.org/mailman/listinfo/bg-linux > http://bg-linux.anl-external.org/wiki > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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