By: Seni (seniike.delete@this.hotmail.com), February 4, 2015 12:33 pm
Room: Moderated Discussions
Maynard Handley (name99.delete@this.name99.org) on February 4, 2015 11:42 am wrote:
> Seni (seniike.delete@this.hotmail.com) on February 4, 2015 1:19 am wrote:
> > Ronald Maas (rmaas.delete@this.wiwo.nl) on February 3, 2015 8:23 pm wrote:
> > > Hugo Décharnes (hdecharn.delete@this.outlook.fr) on February 3, 2015 2:20 pm wrote:
> > > > Cortex-A57 delivers better performances than Cortex-A15, though their micro-architectures
> > > > are–nearly–identical. We'll see if ARM Ltd. reiterates with Cortex-A72.
> > >
> > > ARM's own web page about Cortex-A72 mentions 'major micro-architectural improvements'. This
> > > implies that the micro-architecture will be different compared to the Cortex-A15/A57.
> > >
> > > So guys. Any ideas what ARM could have do to make such an impressive performance
> > > improvement compared to A57? My pick (entirely speculative of cause):
> > >
> > > - 4 instruction decoder
> > > - memory disambiguation
> > > - 2 x 128-bit NEON execution units
> > >
> > > Ronald
> >
> > Most likely:
> >
> > - repipelined for ~30% higher frequency target
> > - more simd
> > - wider memory bus
> > - nothing else
>
> You don't think they'll at least add the ARMv8.1 RMW atomics? (Not that that changes performance
> substantially, but I imagine they want that part of the ISA to be universalized ASAP.)
If they did, it wouldn't count as a major microarchitectural improvement, because it's not microarchitectural at all. It's just architectural.
> Seni (seniike.delete@this.hotmail.com) on February 4, 2015 1:19 am wrote:
> > Ronald Maas (rmaas.delete@this.wiwo.nl) on February 3, 2015 8:23 pm wrote:
> > > Hugo Décharnes (hdecharn.delete@this.outlook.fr) on February 3, 2015 2:20 pm wrote:
> > > > Cortex-A57 delivers better performances than Cortex-A15, though their micro-architectures
> > > > are–nearly–identical. We'll see if ARM Ltd. reiterates with Cortex-A72.
> > >
> > > ARM's own web page about Cortex-A72 mentions 'major micro-architectural improvements'. This
> > > implies that the micro-architecture will be different compared to the Cortex-A15/A57.
> > >
> > > So guys. Any ideas what ARM could have do to make such an impressive performance
> > > improvement compared to A57? My pick (entirely speculative of cause):
> > >
> > > - 4 instruction decoder
> > > - memory disambiguation
> > > - 2 x 128-bit NEON execution units
> > >
> > > Ronald
> >
> > Most likely:
> >
> > - repipelined for ~30% higher frequency target
> > - more simd
> > - wider memory bus
> > - nothing else
>
> You don't think they'll at least add the ARMv8.1 RMW atomics? (Not that that changes performance
> substantially, but I imagine they want that part of the ISA to be universalized ASAP.)
If they did, it wouldn't count as a major microarchitectural improvement, because it's not microarchitectural at all. It's just architectural.
Topic | Posted By | Date |
---|---|---|
ARM announces A72 | Maynard Handley | 2015/02/03 11:36 AM |
ARM announces A72 | anon | 2015/02/03 12:53 PM |
ARM announces A72 | Hugo Décharnes | 2015/02/03 01:20 PM |
ARM announces A72 | juanrga | 2015/02/03 04:15 PM |
ARM announces A72 | Wilco | 2015/02/04 12:58 AM |
ARM announces A72 | Eric Bron | 2015/02/04 01:48 AM |
ARM announces A72 | none | 2015/02/04 02:24 AM |
ARM announces A72 | Eric Bron | 2015/02/04 02:42 AM |
ARM announces A72 | Exophase | 2015/02/04 07:01 AM |
ARM announces A72 | Anon | 2015/02/04 07:35 AM |
ARM announces A72 | Exophase | 2015/02/04 07:58 AM |
ARM announces A72 | Groo | 2015/02/04 09:24 AM |
ARM Marketing, BS up to my ears | David Kanter | 2015/02/04 10:51 AM |
ARM Marketing, BS up to my ears | Maynard Handley | 2015/02/04 01:59 PM |
ARM Marketing, BS up to my ears | David Kanter | 2015/02/04 02:21 PM |
ARM Marketing, BS up to my ears | Groo | 2015/02/04 02:30 PM |
ARM announces A72 | juanrga | 2015/02/04 04:23 AM |
ARM announces A72 | Wilco | 2015/02/04 03:01 PM |
ARM announces A72 | juanrga | 2015/02/04 04:06 PM |
ARM announces A72 | Anon | 2015/02/04 01:28 AM |
ARM announces A72 | juanrga | 2015/02/04 04:31 AM |
ARM announces A72 | Aaron Spink | 2015/02/04 06:49 AM |
ARM announces A72 | Ronald Maas | 2015/02/03 07:23 PM |
ARM announces A72 | Seni | 2015/02/04 12:19 AM |
ARM announces A72 | Maynard Handley | 2015/02/04 10:42 AM |
ARM announces A72 | Seni | 2015/02/04 12:33 PM |
ARM announces A72 | dmcq | 2015/02/04 12:57 PM |
ARM announces A72 | Ronald Maas | 2015/02/04 06:42 PM |
ARM announces A72 | anon | 2015/02/04 05:19 AM |
ARM announces A72 | Exophase | 2015/02/04 07:31 AM |
ARM announces A72 | David Kanter | 2015/02/04 10:25 AM |
ARM announces A72 | Exophase | 2015/02/04 01:33 PM |
ARM announces A72 | anon | 2015/02/04 10:27 PM |
ARM announces A72 (fixed format) | anon | 2015/02/04 10:29 PM |
ARM announces A72 | Exophase | 2015/02/04 11:11 PM |
ARM announces A72 | anon | 2015/02/05 12:02 AM |
ARM announces A72 | anon | 2015/02/04 05:57 PM |
ARM announces A72 | Wilco | 2015/02/03 01:39 PM |
ARM announces A72 | Maynard Handley | 2015/02/03 02:13 PM |
ARM announces A72 | anon | 2015/02/03 02:29 PM |
ARM announces A72 | Wilco | 2015/02/03 02:44 PM |
ARM announces A72 | David Kanter | 2015/02/04 09:56 AM |
ARM announces A72 | Peter Greenhalgh | 2015/02/04 10:56 AM |
ARM announces A72 | Aaron Spink | 2015/02/04 11:59 AM |
ARM announces A72 | Alberto | 2015/02/07 10:22 AM |
ARM announces A72 | Exophase | 2015/02/07 10:47 AM |
ARM announces A72 | Alberto | 2015/02/07 12:44 PM |
ARM announces A72 | Exophase | 2015/02/07 02:35 PM |
ARM announces A72 | Alberto | 2015/02/08 01:09 AM |
ARM announces A72 | Exophase | 2015/02/08 11:05 AM |
ARM announces A72 | David Kanter | 2015/02/08 12:39 AM |
ARM announces A72 | dmcq | 2015/02/08 04:14 AM |
ARM announces A72 | Michael S | 2015/02/08 04:38 AM |
ARM announces A72 | Gabriele Svelto | 2015/02/10 05:11 AM |
ARM announces A72 | Jouni Osmala | 2015/02/10 11:24 AM |
slit vs unified | Michael S | 2015/02/10 01:57 PM |
slit vs unified | dmcq | 2015/02/11 05:44 AM |
ARM announces A72 | Doug S | 2015/02/08 09:00 AM |
ARM announces A72 | Exophase | 2015/02/08 10:57 AM |
ARM announces A72 | dmcq | 2015/02/04 01:10 PM |
ARM announces A72 | David Kanter | 2015/02/04 02:28 PM |
ARM announces A72 | Wilco | 2015/02/04 01:59 PM |
ARM announces A72 | Aaron Spink | 2015/02/04 09:31 PM |
Intel 32nm vs 14 nm | Michael S | 2015/02/05 01:03 AM |
Intel 32nm vs 14 nm | Wilco | 2015/02/05 02:27 AM |
Intel 32nm vs 14 nm | David Kanter | 2015/02/05 09:05 AM |
Intel 32nm vs 14 nm | carop | 2015/02/05 11:12 AM |
Normalize to drawn or effective width? | David Kanter | 2015/02/05 11:45 AM |
Normalize to drawn or effective width? | carop | 2015/02/05 02:40 PM |
Normalize to drawn or effective width? | David Kanter | 2015/02/06 12:44 PM |