Definitely a mistake

By: Michael S (already5chosen.delete@this.yahoo.com), December 22, 2018 8:45 am
Room: Moderated Discussions
David Kanter (dkanter.delete@this.realworldtech.com) on December 21, 2018 8:09 am wrote:
> Michael S (already5chosen.delete@this.yahoo.com) on December 21, 2018 6:39 am wrote:
> > anon (spam.delete.delete.delete@this.this.this.spam.com) on December 21, 2018 5:30 am wrote:
> > > Michael S (already5chosen.delete@this.yahoo.com) on December 21, 2018 3:46 am wrote:
> > > > Maynard Handley (name99.delete@this.name99.org) on December 20, 2018 6:43 pm wrote:
> > > > > itsmydamnation (no.delete@this.way.com) on December 20, 2018 2:02 pm wrote:
> > > > > > Anon (Anon.delete@this.anon.com) on December 20, 2018 11:07 am wrote:
> > > > > > > https://newsroom.ibm.com/2018-12-20-IBM-Expands-Strategic-Partnership-with-Samsung-to-Include-7nm-Chip-Manufacturing
> > > > > >
> > > > > > This was the thing i actually wondered about most when GF made the 7nm abandonment announcement.
> > > > > > How much process development capability does IBM have left? Will IBM work with Samsung
> > > > > > to develop things like edram for their 7nm process, can it already do it?
> > > > > >
> > > > > > Its going to be interesting to exactly what the 7nm power chips look like.
> > > > >
> > > > > There are many ways to skin a cat. IBM may perhaps have to give up on-chip eDRAM, but as a replacement they
> > > > > may be able to use some sort of die-die stacking to put
> > > > > a massive L3 cache as a separate die under the logic
> > > > > die. (To goose the performance a little, you could also do mid-90s things like have on-logic-die tags for
> > > > > the L3, with the L3 data on the separate die, but I don't know if that's worth the hassle.)
> > > > >
> > > >
> > > > There are many ways to skin a power cat. Not so many way for skinning cat360.
> > > >
> > > > Traditionally S/360 designer don't trust SRAM for long-term storage.
> > > > For years their SRAM caches were write-through (their preffered term is store-through)
> > > > and most recently (z14) they got rid of SRAM caches completely.
> > >
> > > I'm pretty sure the L1 is still SRAM.
> >
> >
> > From my copy of "IBM z14 Technical Guide".
> >
The cache hierarchy (L1, L2, L3, and L4) is implemented with
> > embedded dynamic random access memory (eDRAM) caches.

> >
> > Do you think that's a mistake in the Guide ?
>
> Yes. That is 100% a mistake.

My previous copy was draft, but now I downloaded a final version. It says the same.

> DRAM isn't fast enough for the L1 cache.
>
> David
>

The very next sentence: "Until recently, eDRAM was considered to be too slow for this use.
However, a breakthrough in technology made by IBM has eliminated that limitation."

Also on p.91: "L1 and L2 caches use eDRAM, and are private for each PU core".

p.455 sounds weird: "14nm FINFET SOI technology with IBM embedded dynamic static random access memory (eDRAM) technology".
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
IBM Going with Samsung after dumping GlobalFoundriesAnon2018/12/20 12:07 PM
  IBM Going with Samsung after dumping GlobalFoundriesitsmydamnation2018/12/20 03:02 PM
    IBM Going with Samsung after dumping GlobalFoundriesanon2018/12/20 04:50 PM
    IBM Going with Samsung after dumping GlobalFoundriesMaynard Handley2018/12/20 07:43 PM
      IBM Going with Samsung after dumping GlobalFoundriesMichael S2018/12/21 04:46 AM
        IBM Going with Samsung after dumping GlobalFoundriesanon2018/12/21 06:30 AM
          IBM Going with Samsung after dumping GlobalFoundriesMichael S2018/12/21 07:39 AM
            IBM Going with Samsung after dumping GlobalFoundriesanon2018/12/21 08:24 AM
            Definitely a mistakeDavid Kanter2018/12/21 09:09 AM
              Definitely a mistakeMichael S2018/12/22 08:45 AM
                Definitely a mistakedmcq2018/12/22 11:26 AM
                Definitely a mistakeRobert Williams2018/12/22 11:40 AM
                Definitely a mistakesomeone2018/12/22 01:46 PM
                L1 caches are SRAMDavid Kanter2018/12/22 02:27 PM
                Definitely a mistakeanon2018/12/22 02:30 PM
                Definitely a mistakecarop2018/12/22 08:09 PM
                L1 caches are SRAMjuanrga2018/12/23 05:23 AM
    IBM Going with Samsung after dumping GlobalFoundriesDavid Kanter2018/12/20 09:28 PM
      IBM Going with Samsung after dumping GlobalFoundriesKevin G2018/12/21 08:57 AM
        Samsung fabbed Alpha 21164A chips in 1996/7Mark Roulo2018/12/21 05:24 PM
          Samsung fabbed Alpha 21164A chips in 1996/7Kevin G2018/12/25 03:03 PM
      IBM Going with Samsung after dumping GlobalFoundriesAdrian2018/12/21 11:55 PM
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