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TheKanter's profile
David Kanter
David Kanter
David Kanter
@TheKanter

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David Kanter

@TheKanter

San Francisco
realworldtech.com
Joined November 2009

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    1. Daniel Gruss‏ @lavados Sep 13
      Replying to @jonmasters @Dayman58 and

      What is the small page size? 16kb?

      2 replies 0 retweets 1 like
    2. Daniel Gruss‏ @lavados Sep 13
      Replying to @lavados @jonmasters and

      With 16kb small pages this is no magic...

      3 replies 0 retweets 1 like
    3. Jon Masters‏ @jonmasters Sep 13
      Replying to @lavados @Dayman58 and

      Sure, I know, but there’s a difference between it being possible vs them building an L1 that large...in a phone

      2 replies 0 retweets 1 like
    4. Jon Masters‏ @jonmasters Sep 13
      Replying to @jonmasters @lavados and

      Sorry, I meant in a “phone”. Sure, Phone, yeah, definitely only a Phone

      1 reply 0 retweets 1 like
    5. Daniel Gruss‏ @lavados Sep 13
      Replying to @jonmasters @Dayman58 and

      Well... This "phone" had for years processors with optimizations no other phone had...

      2 replies 0 retweets 4 likes
    6. David Kanter‏ @TheKanter Sep 13
      Replying to @lavados @jonmasters and

      Do we know load-to-use latency? Also as reference, IBM z13 is also 128KB (5GHz), but burns far more power.

      2 replies 0 retweets 4 likes
    7. David Schor‏ @david_schor Sep 13
      Replying to @TheKanter @lavados and

      And they use 4 KiB pages, same as x86.

      3 replies 0 retweets 1 like
    8. Jon Masters‏ @jonmasters Sep 13
      Replying to @david_schor @TheKanter and

      Indeed. Either they're doing what I described with checking all possible tag matches or they're PIPT underneath

      1 reply 0 retweets 0 likes
    9. David Kanter‏ @TheKanter Sep 13
      Replying to @jonmasters @david_schor and

      https://www.hotchips.org/wp-content/uploads/hc_archives/hc29/HC29.22-Tuesday-Pub/HC29.22.90-Server-Pub/HC29.22.910-Z14-processor-Jacobi-IBM.pdf … probably has the answers. Although that’s z14. It’s clearly VIVT

      1 reply 0 retweets 1 like
    10. Jon Masters‏ @jonmasters Sep 13
      Replying to @TheKanter @david_schor and

      They say they used a new "logically tagged directory" cache design. I have heard of this but only in the literature. Like I said, this is IBM, so but of course

      1 reply 0 retweets 0 likes
      David Kanter‏ @TheKanter Sep 13
      Replying to @jonmasters @david_schor and

      IBM zArch “logical” is what the rest of the world calls virtual. Terminology issues...

      7:15 PM - 13 Sep 2018
      • 1 Like
      • John Garfield
      2 replies 0 retweets 1 like
        1. New conversation
        2. Jon Masters‏ @jonmasters Sep 13
          Replying to @TheKanter @david_schor and

          Nope - not just that - read the slides, they integrated the TLB into a single structure with a new directory lookup. So it's not /just/ VIVT how everyone else does it. They need to prevent conflicting tags, seems they do this by also factoring the AS ID into the new dir design

          1 reply 0 retweets 3 likes
        3. Daniel Gruss‏ @lavados Sep 14
          Replying to @jonmasters @TheKanter and

          That does not solve all problems... Aliasing can still occur..

          1 reply 0 retweets 1 like
        4. Jon Masters‏ @jonmasters Sep 14
          Replying to @lavados @TheKanter and

          Indeed. They must have solved this. More weekend reading...

          1 reply 0 retweets 1 like
        5. Daniel Gruss‏ @lavados Sep 14
          Replying to @jonmasters @TheKanter and

          Older AMDs accepted aliasing afaik... It just means performance penalties for some cases... So it is a trade of between these cases and others that would benefit from the larger cache size...

          3 replies 0 retweets 0 likes
        6. John Garfield‏ @peresuslog Oct 2
          Replying to @lavados @jonmasters and

          I never understood why most CPUs don't just deal with aliasing in hardware anymore, except smaller ARM cores. Don't you just have to check for aliases on line fills? Does this make pipelining harder or something?

          0 replies 0 retweets 1 like
        7. End of conversation
        1. John Garfield‏ @peresuslog Sep 13
          Replying to @TheKanter @jonmasters and

          They also have issue and dispatch reversed.

          0 replies 0 retweets 2 likes
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