By: Travis (travis.downs.delete@this.gmail.com), October 30, 2016 6:09 pm
Room: Moderated Discussions
David Hess (davidwhess.delete@this.gmail.com) on October 25, 2016 10:37 pm wrote:
> Travis (travis.downs.delete@this.gmail.com) on October 25, 2016 10:22 pm wrote:
> >
> > Of course, it's obvious that they have designed it for the target speeds. Neither
> > of your conclusions regarding L1 latency follow from that, however.
>
> So they designed with a 4 cycle load latency when they could have used a 3 or 2 cycle load latency?
>
Yes, of course they could implement a 2 or 3 cycle latency or an 8 or 16 cycle latency or whatever they want. Whether it makes sense is another question! Presumably the tradeoffs involved means that only a very small range of load-to-use latency makes sense for most code on modern processes and architectures, which is why you see typical latencies in the 2-5 cycle range usually.
You'll have to me more explicit with me though, because I'm not sure what you are getting at. Your original statements both seem false, but if you want to discuss something else then be clear!
> Travis (travis.downs.delete@this.gmail.com) on October 25, 2016 10:22 pm wrote:
> >
> > Of course, it's obvious that they have designed it for the target speeds. Neither
> > of your conclusions regarding L1 latency follow from that, however.
>
> So they designed with a 4 cycle load latency when they could have used a 3 or 2 cycle load latency?
>
Yes, of course they could implement a 2 or 3 cycle latency or an 8 or 16 cycle latency or whatever they want. Whether it makes sense is another question! Presumably the tradeoffs involved means that only a very small range of load-to-use latency makes sense for most code on modern processes and architectures, which is why you see typical latencies in the 2-5 cycle range usually.
You'll have to me more explicit with me though, because I'm not sure what you are getting at. Your original statements both seem false, but if you want to discuss something else then be clear!
Topic | Posted By | Date |
---|---|---|
Neat die area comparison image | Rob | 2016/10/21 05:39 PM |
Neat die area comparison image | anonymou5 | 2016/10/21 06:44 PM |
Neat die area comparison image | Mr. Camel | 2016/10/22 04:58 AM |
Neat die area comparison image | Heikki Kultala | 2016/10/22 05:19 AM |
Neat die area comparison image | Mr. Camel | 2016/10/22 07:10 AM |
Neat die area comparison image | Mr. Camel | 2016/10/22 07:15 AM |
different caches... | Heikki Kultala | 2016/10/22 08:29 AM |
Broadwell includes LLC, just for comparision | anon | 2016/10/22 08:52 AM |
Broadwell includes LLC, just for comparision | juanrga | 2016/10/23 06:09 AM |
Broadwell includes LLC, just for comparision | anon | 2016/10/23 07:25 AM |
Broadwell includes LLC, just for comparision | juanrga | 2016/10/25 09:57 AM |
Broadwell includes LLC, just for comparision | Simon Farnsworth | 2016/10/25 11:03 AM |
Broadwell includes LLC, just for comparision | juanrga | 2016/10/28 02:02 AM |
Broadwell includes LLC, just for comparision | anon | 2016/10/28 04:13 AM |
Broadwell includes LLC, just for comparision | juanrga | 2016/10/29 09:47 PM |
Broadwell includes LLC, just for comparision | Travis | 2016/10/30 06:34 PM |
Broadwell includes LLC, just for comparision | juanrga | 2016/10/31 04:35 AM |
Broadwell includes LLC, just for comparision | Simon Farnsworth | 2016/10/31 04:42 AM |
Broadwell includes LLC, just for comparision | anon | 2016/11/01 12:56 PM |
Broadwell includes LLC, just for comparision | Maynard Handley | 2016/11/01 01:37 PM |
Broadwell includes LLC, just for comparision | anon | 2016/11/01 04:22 PM |
Broadwell includes LLC, just for comparision | Maynard Handley | 2016/11/01 07:30 PM |
Broadwell includes LLC, just for comparision | anon | 2016/11/02 06:15 AM |
Broadwell includes LLC, just for comparision | Maynard Handley | 2016/11/02 09:23 AM |
Broadwell includes LLC, just for comparision | anon | 2016/11/02 11:50 AM |
Broadwell includes LLC, just for comparision | Simon Farnsworth | 2016/11/02 02:48 AM |
Broadwell includes LLC, just for comparision | Simon Farnsworth | 2016/10/28 06:19 AM |
Broadwell includes LLC, just for comparision | juanrga | 2016/10/29 10:15 PM |
Broadwell includes LLC, just for comparision | Simon Farnsworth | 2016/10/30 12:31 PM |
Broadwell includes LLC, just for comparision | Ricardo B | 2016/10/29 05:30 PM |
underclocked is different than designed for low clock speed | Heikki Kultala | 2016/10/25 11:47 PM |
underclocked is different than designed for low clock speed | Maynard Handley | 2016/10/26 10:07 AM |
That wasn't the point | juanrga | 2016/10/28 02:15 AM |
Even without the point you have invalid comparison | Heikki Kultala | 2016/10/28 09:03 AM |
8 wide vs 6 wide | juanrga | 2016/10/29 10:41 PM |
8 wide vs 6 wide | Wilco | 2016/10/30 05:00 AM |
8 wide vs 6 wide | Doug S | 2016/10/30 12:20 PM |
8 wide vs 6 wide | Wilco | 2016/10/30 01:12 PM |
8 wide vs 6 wide | juanrga | 2016/10/30 02:56 PM |
8 wide vs 6 wide | Travis | 2016/10/30 07:13 PM |
8 wide vs 6 wide | juanrga | 2016/10/31 04:55 AM |
8 wide vs 6 wide | anon | 2016/11/01 01:00 PM |
SoftMachines | none | 2016/11/02 03:57 AM |
SoftMachines | David Kanter | 2016/11/02 08:53 AM |
8 wide vs 6 wide | juanrga | 2016/11/03 12:35 PM |
8 wide vs 6 wide | Wilco | 2016/11/03 02:13 PM |
8 wide vs 6 wide | juanrga | 2016/11/03 07:35 PM |
8 wide vs 6 wide | Wilco | 2016/11/04 01:27 PM |
8 wide vs 6 wide | juanrga | 2016/11/04 06:08 PM |
8 wide vs 6 wide | Wilco | 2016/11/06 04:52 AM |
8 wide vs 6 wide | juanrga | 2016/11/06 04:56 PM |
8 wide vs 6 wide | Wilco | 2016/11/07 04:25 AM |
8 wide vs 6 wide | Aaron Spink | 2016/11/04 04:08 PM |
8 wide vs 6 wide | juanrga | 2016/11/04 06:10 PM |
Dunning-Krueger effect | Heikki Kultala | 2016/11/04 03:22 AM |
Dunning-Krueger effect | itsmydamnation | 2016/11/04 02:48 PM |
8 wide vs 6 wide | anon | 2016/11/04 03:38 AM |
8 wide vs 6 wide | juanrga | 2016/11/04 05:05 AM |
8 wide vs 6 wide | anon | 2016/11/04 06:12 AM |
8 wide vs 6 wide | Wilco | 2016/11/04 01:12 PM |
8 wide vs 6 wide | anon | 2016/11/04 02:54 PM |
8 wide vs 6 wide | juanrga | 2016/11/04 05:34 PM |
8 wide vs 6 wide | anon | 2016/11/05 02:14 AM |
8 wide vs 6 wide | juanrga | 2016/11/04 05:39 PM |
8 wide vs 6 wide | Wilco | 2016/11/06 05:15 AM |
8 wide vs 6 wide | juanrga | 2016/11/06 05:06 PM |
8 wide vs 6 wide | Wilco | 2016/11/07 03:45 AM |
8 wide vs 6 wide | David Kanter | 2016/11/07 08:43 PM |
8 wide vs 6 wide | Wilco | 2016/11/08 03:57 AM |
8 wide vs 6 wide | juanrga | 2016/11/14 12:12 PM |
8 wide vs 6 wide | Wilco | 2016/11/14 04:53 PM |
8 wide vs 6 wide | dmcq | 2016/11/15 03:17 AM |
8 wide vs 6 wide | Wilco | 2016/11/15 03:43 AM |
8 wide vs 6 wide | dmcq | 2016/11/15 04:28 AM |
1 µop per instruction is not necessary | Paul A. Clayton | 2016/11/17 12:09 PM |
8 wide vs 6 wide | juanrga | 2016/11/20 06:56 AM |
8 wide vs 6 wide | Wilco | 2016/11/21 05:54 PM |
8 wide vs 6 wide | juanrga | 2016/11/22 08:49 AM |
8 wide vs 6 wide | Wilco | 2016/11/22 03:25 PM |
8 wide vs 6 wide | Wilco | 2016/10/31 03:03 AM |
Skylake can retire 8 uops | David Kanter | 2016/10/31 12:41 AM |
Skylake can retire 8 uops | juanrga | 2016/10/31 04:15 AM |
Skylake can retire 8 uops | Alberto | 2016/11/04 07:22 AM |
8 wide vs 6 wide bogus numbers | Heikki Kultala | 2016/10/30 06:25 AM |
Broadwell includes LLC, just for comparision | anon | 2016/10/26 03:10 AM |
Pushing the hidden agenda | juanrga | 2016/10/28 03:11 AM |
Pushing the hidden agenda | anon | 2016/10/28 04:35 AM |
Neat die area comparison image | David Hess | 2016/10/22 01:26 PM |
Neat die area comparison image | anon2 | 2016/10/22 05:20 PM |
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Neat die area comparison image | anon2 | 2016/10/23 01:50 AM |
Neat die area comparison image | Travis | 2016/10/24 01:26 PM |
Neat die area comparison image | Maynard Handley | 2016/10/24 04:27 PM |
Neat die area comparison image | juanrga | 2016/10/25 10:02 AM |
Neat die area comparison image | David Hess | 2016/10/25 09:59 PM |
Neat die area comparison image | Travis | 2016/10/25 10:22 PM |
Neat die area comparison image | David Hess | 2016/10/25 10:37 PM |
Neat die area comparison image | Travis | 2016/10/30 06:09 PM |
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Neat die area comparison image | Doug S | 2016/10/26 08:17 AM |
Neat die area comparison image | Jukka Larja | 2016/10/27 09:28 AM |
Neat die area comparison image | anon | 2016/10/26 03:32 AM |
Neat die area comparison image | juanrga | 2016/10/23 06:29 AM |
Neat die area comparison image | Matthias Waldhauer | 2016/10/22 06:12 AM |
Neat die area comparison image | juanrga | 2016/10/23 05:44 AM |
Neat die area comparison image | Gabriele Svelto | 2016/10/24 02:17 AM |