Date: Wed, 22 Nov 2006 21:16:25 +0100 From: Ulrich Spoerlein <uspoerlein@gmail.com> To: Alan Cox <alc@cs.rice.edu> Cc: Kip Macy <kip.macy@gmail.com>, arch@freebsd.org Subject: Re: superpage plans Message-ID: <20061122201625.GC1522@roadrunner.q.local> In-Reply-To: <45649E42.70409@cs.rice.edu> References: <b1fa29170611220939g32469638ncf3a3ddd4bba3670@mail.gmail.com> <45649E42.70409@cs.rice.edu>
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Alan Cox wrote: > Lastly, page coloring dies. However, the beneficial effects of page coloring are for the > most part captured by superpages. Specifically, regardless of whether the pmap is able to > promote a particular region of the address space to a superpage, e.g., due to heterogenous > access rights of pages within the region, if the memory has been provided by the reservation > system it will have "perfect" coloring. Hi Alan, what performance impact do you estimate for "older" processors? I know very little about superpages, so I assume that, e.g., earlier Pentiums don't support it? Where do you think the break off point lies? Ulrich Spoerlein -- A: Yes. >Q: Are you sure? > >A: Because it reverses the logical flow of conversation. > >>Q: Why is top posting frowned upon?
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