4K pages probably used to be too large

By: Chester (lamchester.delete@this.gmail.com), May 5, 2021 6:45 pm
Room: Moderated Discussions
> > Assuming you still want to keep "L1 "way size" = page size, that gives you
> > 8 cachelines per "way". I think once ARM made a 32-way L1 cache that they
> > claimed it was faster as 32-way, but that was certainly the exception.
> >
> > Do you want "60-way" caches?
>
> No.
>
> > Add some sort of inital TLB lookup to the L1 latency
> > (which of course would require more entries, because smaller pages)?
>
> I don't know what your question is.

I think that refers to VIPT caches, where way size = page size is natural?

But K10 got 3 cycle latency with a 64K 2-way L1D, so clearly way size = page size isn't the only way to go.

> > It might have worked for the 386, but I think the more advanced RISCs and P6 might have had
> > a lot of difficulty with L1 cache design and fast TLB lookup. And things would only get worse.
> > And I'm really guessing that HDD transfer rates were the real reason for the 4k size.
> >
> > Even modern disk drives use 4k pages, although I'm sure that has more to do with newer ECC
> > algorithms (and the need for their efficiency) than any underlying preference for 4k pages.
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
4K pages probably used to be too largeYuhong Bao2021/05/01 01:01 PM
  HDD seek time isn't freeMark Roulo2021/05/01 02:12 PM
    HDD seek time isn't freeYuhong Bao2021/05/01 02:21 PM
      HDD seek time isn't freeTim Mc2021/05/01 02:42 PM
        HDD seek time isn't freerwessel2021/05/01 02:57 PM
  4K pages probably used to be too largeBen LaHaise2021/05/02 10:45 AM
    VAX was 512 (in 1977) (NT)anonymous22021/05/02 08:36 PM
      FWIW, S/370 offered a choice of 2K and 4K (NT)rwessel2021/05/03 05:09 AM
      DEC's earliest PDP-11 disks were 512 (in 1971)John Yates2021/05/03 01:53 PM
    4K pages probably used to be too largeanon22021/05/03 01:17 AM
      4K pages probably used to be too largeBen LaHaise2021/05/03 05:36 PM
        Morotola 680x0 series page sizesBen LaHaise2021/05/03 05:51 PM
        4K pages probably used to be too largeanon22021/05/03 06:39 PM
          4K pages probably used to be too largeanon22021/05/03 08:51 PM
        4K pages probably used to be too largeYuhong Bao2021/05/03 10:51 PM
      4K pages probably used to be too largewumpus2021/05/05 09:06 AM
        4K pages probably used to be too largeanon22021/05/05 04:04 PM
          4K pages probably used to be too largeChester2021/05/05 06:45 PM
            4K pages probably used to be too largewumpus2021/05/06 09:06 AM
              Phenom TLB bugHeikki Kultala2021/05/06 12:46 PM
                Phenom TLB bugChester2021/05/06 05:29 PM
        4K pages probably used to be too largeEtienne Lorrain2021/05/06 01:08 AM
          4K pages probably used to be too largeJames2021/05/06 02:36 AM
            4K pages probably used to be too largerwessel2021/05/06 09:32 AM
              Reformatting SCSI disk sector sizeDoug S2021/05/06 11:30 AM
        4K pages probably used to be too largeDavid Hess2021/05/11 08:57 AM
  Page size is more complex/nuancedPaul A. Clayton2021/05/08 10:03 AM
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