By: Michael S (already5chosen.delete@this.yahoo.com), November 21, 2022 3:43 pm
Room: Moderated Discussions
Andrey (andrey.semashev.delete@this.gmail.com) on November 21, 2022 1:50 pm wrote:
> anonymou5 (no.delete@this.spam.com) on November 21, 2022 1:25 pm wrote:
> > > Of course, if this is done it is done internally in hardware and invisible
> > > to software. Would anyone publish it if they did this?
> >
> > Check the patent literature, for the obvious stuff.
> >
> > Btw, encryption is another aspect which makes the 0-vs-1 debate (as well as DBI) moot.
>
> Encryption happens in the CPU, no? Meaning that the DRAM interface
> would still benefit from DBI the same as with unencrypted data.
>
When DBI is applied to encrypted data (or to any other data with equal probabilities of all 256 byte value), on average it reduces density on zeros only by 18%.
And before you're asking, yes, in DDR4 DBI is used to reduce a density of zeroes, not density of ones.
I don't know why.
> anonymou5 (no.delete@this.spam.com) on November 21, 2022 1:25 pm wrote:
> > > Of course, if this is done it is done internally in hardware and invisible
> > > to software. Would anyone publish it if they did this?
> >
> > Check the patent literature, for the obvious stuff.
> >
> > Btw, encryption is another aspect which makes the 0-vs-1 debate (as well as DBI) moot.
>
> Encryption happens in the CPU, no? Meaning that the DRAM interface
> would still benefit from DBI the same as with unencrypted data.
>
When DBI is applied to encrypted data (or to any other data with equal probabilities of all 256 byte value), on average it reduces density on zeros only by 18%.
And before you're asking, yes, in DDR4 DBI is used to reduce a density of zeroes, not density of ones.
I don't know why.
| Topic | Posted By | Date |
|---|---|---|
| Is 1 more expensive than 0? | Andrey | 2022/11/21 05:23 AM |
| Is 1 more expensive than 0? | Juha Lainema | 2022/11/21 06:15 AM |
| Is 1 more expensive than 0? | Adrian | 2022/11/21 07:21 AM |
| Is 1 more expensive than 0? | anon2 | 2022/11/21 05:29 PM |
| switching between 0 and 1 is what consumes power | Heikki Kultala | 2022/11/21 07:23 AM |
| Thank you all for your answers. (NT) | Andrey | 2022/11/21 08:29 AM |
| Is 1 more expensive than 0? | Foyle | 2022/11/21 08:58 AM |
| Is 1 more expensive than 0? | Michael S | 2022/11/21 10:51 AM |
| Is 1 more expensive than 0? | Captain Obvious | 2022/11/21 11:29 AM |
| obvious stuff | anonymou5 | 2022/11/21 02:25 PM |
| obvious stuff | Andrey | 2022/11/21 02:50 PM |
| obvious stuff | Michael S | 2022/11/21 03:43 PM |
| SRAM is bistable | Anon | 2022/11/21 10:50 AM |
| SRAM is bistable | Andrew Clough | 2022/11/22 05:53 AM |
| NAND Flash 1 and 0 | jokerman | 2022/11/24 01:13 PM |
| NAND Flash 1 and 0 | Joern Engel | 2022/11/25 12:00 AM |
| NAND Flash 1 and 0 | Ungo | 2022/11/25 02:26 AM |
| The ECC needs to be stored. as ones ane zeroes (NT) | Heikki Kultala | 2022/11/25 08:31 AM |
| The ECC needs to be stored. as ones ane zeroes | anon2 | 2022/11/25 05:07 PM |
| The ECC needs to be stored. as ones ane zeroes | Heikki Kultala | 2022/11/26 12:48 AM |
| The ECC needs to be stored. as ones ane zeroes | anon2 | 2022/11/26 02:00 AM |
