By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), September 21, 2021 1:49 pm
Room: Moderated Discussions
sr (nobody.delete@this.nowhere.com) on September 21, 2021 11:07 am wrote:
>
> It's a fundamental problem that Meltdown cpus did wrong.
.. and my point is that that had nothing to do with TLB vs PTB issues. It could - and in fact did - even when you had more of a "permission table" (ie segments).
So my argument is that this whole "PTB can fix TLB issues" is a complete red herring. A PTB doesn't fix anything at all.
Linus
>
> It's a fundamental problem that Meltdown cpus did wrong.
.. and my point is that that had nothing to do with TLB vs PTB issues. It could - and in fact did - even when you had more of a "permission table" (ie segments).
So my argument is that this whole "PTB can fix TLB issues" is a complete red herring. A PTB doesn't fix anything at all.
Linus
| Topic | Posted By | Date |
|---|---|---|
| POWER10 SAP SD benchmark | anon2 | 2021/09/06 03:36 PM |
| POWER10 SAP SD benchmark | Daniel B | 2021/09/07 02:31 AM |
| "Cores" (and SPEC) | Rayla | 2021/09/07 07:51 AM |
| "Cores" (and SPEC) | anon | 2021/09/07 03:56 PM |
| POWER10 SAP SD benchmark | Anon | 2021/09/07 03:24 PM |
| POWER10 SAP SD benchmark | Anon | 2021/09/07 03:27 PM |
| Virtually tagged L1-caches | sr | 2021/09/08 05:49 AM |
| Virtually tagged L1-caches | dmcq | 2021/09/08 08:22 AM |
| Virtually tagged L1-caches | sr | 2021/09/08 08:56 AM |
| Virtually tagged L1-caches | Hugo Décharnes | 2021/09/08 08:58 AM |
| Virtually tagged L1-caches | sr | 2021/09/08 10:09 AM |
| Virtually tagged L1-caches | Hugo Décharnes | 2021/09/08 10:46 AM |
| Virtually tagged L1-caches | sr | 2021/09/08 11:35 AM |
| Virtually tagged L1-caches | Hugo Décharnes | 2021/09/08 12:23 PM |
| Virtually tagged L1-caches | sr | 2021/09/08 12:40 PM |
| Virtually tagged L1-caches | anon | 2021/09/09 03:16 AM |
| Virtually tagged L1-caches | Konrad Schwarz | 2021/09/10 05:19 AM |
| Virtually tagged L1-caches | Hugo Décharnes | 2021/09/10 06:59 AM |
| Virtually tagged L1-caches | anon | 2021/09/14 03:17 AM |
| Virtually tagged L1-caches | dmcq | 2021/09/14 09:34 AM |
| Or use a PLB (NT) | Paul A. Clayton | 2021/09/14 09:45 AM |
| Or use a PLB | Linus Torvalds | 2021/09/14 03:27 PM |
| Or use a PLB | anon | 2021/09/15 12:15 AM |
| Or use a PLB | Michael S | 2021/09/15 03:21 AM |
| Or use a PLB | dmcq | 2021/09/15 03:42 PM |
| Or use a PLB | Konrad Schwarz | 2021/09/16 04:24 AM |
| Or use a PLB | Michael S | 2021/09/16 10:13 AM |
| Or use a PLB | --- | 2021/09/16 01:02 PM |
| PLB reference | Paul A. Clayton | 2021/09/18 02:35 PM |
| PLB reference | Michael S | 2021/09/18 04:14 PM |
| Demand paging/translation orthogonal | Paul A. Clayton | 2021/09/19 07:33 AM |
| Demand paging/translation orthogonal | Michael S | 2021/09/19 09:10 AM |
| PLB reference | Carson | 2021/09/20 10:19 PM |
| PLB reference | sr | 2021/09/20 06:02 AM |
| PLB reference | Michael S | 2021/09/20 07:03 AM |
| PLB reference | Linus Torvalds | 2021/09/20 12:10 PM |
| Or use a PLB | sr | 2021/09/20 04:32 AM |
| Or use a PLB | sr | 2021/09/21 09:36 AM |
| Or use a PLB | Linus Torvalds | 2021/09/21 10:04 AM |
| Or use a PLB | sr | 2021/09/21 10:48 AM |
| Or use a PLB | Linus Torvalds | 2021/09/21 01:55 PM |
| Or use a PLB | sr | 2021/09/22 06:55 AM |
| Or use a PLB | rwessel | 2021/09/22 07:09 AM |
| Or use a PLB | Linus Torvalds | 2021/09/22 11:50 AM |
| Or use a PLB | sr | 2021/09/22 01:00 PM |
| Or use a PLB | dmcq | 2021/09/22 04:07 PM |
| Or use a PLB | Etienne Lorrain | 2021/09/23 08:50 AM |
| Or use a PLB | anon2 | 2021/09/22 04:09 PM |
| Or use a PLB | dmcq | 2021/09/23 02:35 AM |
| Or use a PLB | ⚛ | 2021/09/23 09:37 AM |
| Or use a PLB | Linus Torvalds | 2021/09/23 12:01 PM |
| Or use a PLB | gpd | 2021/09/24 03:59 AM |
| Or use a PLB | Linus Torvalds | 2021/09/24 10:45 AM |
| Or use a PLB | dmcq | 2021/09/24 12:43 PM |
| Or use a PLB | sr | 2021/09/25 10:19 AM |
| Or use a PLB | Linus Torvalds | 2021/09/25 10:44 AM |
| Or use a PLB | sr | 2021/09/25 11:11 AM |
| Or use a PLB | Linus Torvalds | 2021/09/25 11:31 AM |
| Or use a PLB | sr | 2021/09/25 11:52 AM |
| Or use a PLB | Linus Torvalds | 2021/09/25 12:05 PM |
| Or use a PLB | sr | 2021/09/25 12:23 PM |
| Or use a PLB | rwessel | 2021/09/25 03:29 PM |
| Or use a PLB | sr | 2021/10/01 12:22 AM |
| Or use a PLB | rwessel | 2021/10/01 06:19 AM |
| Or use a PLB | David Hess | 2021/10/01 10:35 AM |
| Or use a PLB | rwessel | 2021/10/02 04:47 AM |
| Or use a PLB | sr | 2021/10/02 11:16 AM |
| Or use a PLB | rwessel | 2021/10/02 11:53 AM |
| Or use a PLB | Linus Torvalds | 2021/09/25 11:57 AM |
| Or use a PLB | sr | 2021/09/25 12:07 PM |
| Or use a PLB | Linus Torvalds | 2021/09/25 12:21 PM |
| Or use a PLB | sr | 2021/09/25 12:40 PM |
| Or use a PLB | nksingh | 2021/09/27 09:07 AM |
| Or use a PLB | ⚛ | 2021/09/27 09:02 AM |
| Or use a PLB | Linus Torvalds | 2021/09/27 10:20 AM |
| Or use a PLB | Linus Torvalds | 2021/09/27 12:58 PM |
| Or use a PLB | dmcq | 2021/09/28 10:59 AM |
| Or use a PLB | sr | 2021/09/25 10:34 AM |
| Or use a PLB | rwessel | 2021/09/25 03:44 PM |
| Or use a PLB | sr | 2021/10/01 01:04 AM |
| Or use a PLB | rwessel | 2021/10/01 06:33 AM |
| I386 segmentation highlights | sr | 2021/10/04 07:53 AM |
| I386 segmentation highlights | Adrian | 2021/10/04 09:53 AM |
| I386 segmentation highlights | sr | 2021/10/04 10:19 AM |
| I386 segmentation highlights | rwessel | 2021/10/04 04:57 PM |
| I386 segmentation highlights | sr | 2021/10/05 11:16 AM |
| I386 segmentation highlights | Michael S | 2021/10/05 12:27 PM |
| I386 segmentation highlights | rwessel | 2021/10/05 04:20 PM |
| Or use a PLB | JohnG | 2021/09/25 10:18 PM |
| Or use a PLB | ⚛ | 2021/09/27 07:37 AM |
| Or use a PLB | Heikki Kultala | 2021/09/28 03:53 AM |
| Or use a PLB | rwessel | 2021/09/28 07:29 AM |
| Or use a PLB | David Hess | 2021/09/23 06:00 PM |
| Or use a PLB | Adrian | 2021/09/24 01:21 AM |
| Or use a PLB | dmcq | 2021/09/25 12:41 PM |
| Or use a PLB | blaine | 2021/09/26 11:19 PM |
| Or use a PLB | David Hess | 2021/09/27 11:35 AM |
| Or use a PLB | blaine | 2021/09/27 05:19 PM |
| Or use a PLB | Adrian | 2021/09/27 10:40 PM |
| Or use a PLB | Adrian | 2021/09/27 10:59 PM |
| Or use a PLB | dmcq | 2021/09/28 07:45 AM |
| Or use a PLB | rwessel | 2021/09/28 07:45 AM |
| Or use a PLB | David Hess | 2021/09/28 12:50 PM |
| Or use a PLB | Etienne Lorrain | 2021/09/30 01:25 AM |
| Or use a PLB | David Hess | 2021/10/01 10:40 AM |
| MMU privileges | sr | 2021/09/21 11:07 AM |
| MMU privileges | Linus Torvalds | 2021/09/21 01:49 PM |
| Virtually tagged L1-caches | Konrad Schwarz | 2021/09/16 04:18 AM |
| Virtually tagged L1-caches | Carson | 2021/09/16 01:12 PM |
| Virtually tagged L1-caches | anon2 | 2021/09/16 05:16 PM |
| Virtually tagged L1-caches | rwessel | 2021/09/16 06:29 PM |
| Virtually tagged L1-caches | sr | 2021/09/20 04:20 AM |
| Virtually tagged L1-caches | --- | 2021/09/08 02:28 PM |
| Virtually tagged L1-caches | anonymou5 | 2021/09/08 08:28 PM |
| Virtually tagged L1-caches | anonymou5 | 2021/09/08 08:34 PM |
| Virtually tagged L1-caches | --- | 2021/09/09 10:14 AM |
| Virtually tagged L1-caches | anonymou5 | 2021/09/09 10:44 PM |
| Multi-threading? | David Kanter | 2021/09/09 09:32 PM |
| Multi-threading? | --- | 2021/09/10 09:19 AM |
| Virtually tagged L1-caches | sr | 2021/09/11 01:19 AM |
| Virtually tagged L1-caches | sr | 2021/09/11 01:36 AM |
| Virtually tagged L1-caches | --- | 2021/09/11 09:53 AM |
| Virtually tagged L1-caches | sr | 2021/09/12 12:43 AM |
| Virtually tagged L1-caches | Linus Torvalds | 2021/09/12 11:10 AM |
| Virtually tagged L1-caches | sr | 2021/09/12 11:57 AM |
| Virtually tagged L1-caches | dmcq | 2021/09/13 08:31 AM |
| Virtually tagged L1-caches | sr | 2021/09/20 04:11 AM |
| Virtually tagged L1-caches | sr | 2021/09/11 02:49 AM |
| Virtually tagged L1-caches | Linus Torvalds | 2021/09/08 12:34 PM |
| Virtually tagged L1-caches | dmcq | 2021/09/09 02:46 AM |
| Virtually tagged L1-caches | dmcq | 2021/09/09 02:58 AM |
| Virtually tagged L1-caches | sr | 2021/09/11 01:29 AM |
| Virtually tagged L1-caches | dmcq | 2021/09/11 08:59 AM |
| Virtually tagged L1-caches | sr | 2021/09/12 12:57 AM |
| Virtually tagged L1-caches | dmcq | 2021/09/12 08:44 AM |
| Virtually tagged L1-caches | sr | 2021/09/12 09:48 AM |
| Virtually tagged L1-caches | dmcq | 2021/09/12 01:22 PM |
| Virtually tagged L1-caches | sr | 2021/09/20 04:40 AM |
| Where do you see this information? (NT) | anon2 | 2021/09/09 02:45 AM |
| Where do you see this information? | sr | 2021/09/11 01:40 AM |
| Where do you see this information? | anon2 | 2021/09/11 01:53 AM |
| Where do you see this information? | sr | 2021/09/11 02:08 AM |
| Thank you (NT) | anon2 | 2021/09/11 04:31 PM |
