DOS ain't dead - about to fix the "final" doslfn bug

about to fix the "final" doslfn bug (Announce)

posted by Zyzzle, 13.04.2022, 10:27

> > The real question is why it's so slow (the RAM drive in particular).
>
> Perhaps it's not related to doslfn at all. It might be a BIOS bug, setting
> up memory beyond 4GB as "uncachable" via MTRRs. I remember that, when
> HimemSX was introduced, another member of this forum (Zyzzle?) had such
> problems.

Yes, that is correct. Some of the memory beyond 4GB is "uncacheable" via MTRRs and only showing a 50 mb/sec transfer speed on an i5-8250 system. That system doesn't enable MTRRs for some reason, and it slowed memory transfers down by a factor of about 500x. No system that I've tested above a 5th Gen core i5 system has successfully cached memory in MTRRs. Limitation of Intel's? BIOS limitation? I can't figure why this feature has been disabled or crippled.

When HimemSX was tested on a system which does cache memory > 4GB via MTRRs, the memory speed was something around 10 GB / sec or greater on an core i5 5600 laptop. This laptop would also properly cache MTRRs via RayeR's MTRRLFBE utility while my core i5-8250 more recent laptop doesn't (executing MTRRLFBE wc lfb freezes the system).

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Complete thread:

RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 13.03.2022, 13:58 (Announce)
- RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 13.03.2022, 16:50
  - RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 14.03.2022, 02:24
    - RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 17.03.2022, 06:05
      - RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 17.03.2022, 08:15
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 17.03.2022, 10:27
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 17.03.2022, 13:00
        RDRVSX32: FAT32 RAM drive for HimemSX - Zyzzle, 17.03.2022, 23:06
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 18.03.2022, 02:35
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 18.03.2022, 06:58
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 19.03.2022, 03:18
        RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 19.03.2022, 05:24
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 19.03.2022, 09:26
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 01.04.2022, 09:33
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 24.04.2022, 07:38
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 24.04.2022, 09:43
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 24.04.2022, 13:35
        RDRVSX32: FAT32 RAM drive for HimemSX - tom, 16.05.2022, 20:40
        RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 18.05.2022, 10:26
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 21.05.2022, 13:23
        RDRVSX32: FAT32 RAM drive for HimemSX - tom, 21.05.2022, 15:14
        RDRVSX32: FAT32 RAM drive for HimemSX - tom, 21.05.2022, 17:41
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 22.05.2022, 09:23
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 23.05.2022, 13:53
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 26.04.2022, 05:20
- RDRVSX32: FAT32 RAM drive for HimemSX - Zyzzle, 14.03.2022, 06:12
  - RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 15.03.2022, 15:25
    - RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 16.03.2022, 04:30
      - RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 16.03.2022, 06:44
        RDRVSX32: FAT32 RAM drive for HimemSX - rr, 16.03.2022, 09:01
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 16.03.2022, 14:14
        RDRVSX32: FAT32 RAM drive for HimemSX - Zyzzle, 17.03.2022, 03:04
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 17.03.2022, 05:04
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 16.03.2022, 15:59
        RDRVSX32: FAT32 RAM drive for HimemSX - tom, 16.03.2022, 16:20
        RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 16.03.2022, 17:29
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 17.03.2022, 04:12
        RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 17.03.2022, 08:01
        RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 16.03.2022, 17:22
        RDRVSX32: FAT32 RAM drive for HimemSX - tom, 16.03.2022, 18:34
        RDRVSX32: FAT32 RAM drive for HimemSX - Zyzzle, 17.03.2022, 03:10
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 17.03.2022, 04:22
        RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 17.03.2022, 11:32
        RDRVSX32: FAT32 RAM drive for HimemSX - Richard, 01.04.2022, 14:28
        RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 01.04.2022, 14:58
- RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 14.03.2022, 15:09
  - RDRVSX32: FAT32 RAM drive for HimemSX - tom, 15.03.2022, 12:25
    - RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 15.03.2022, 13:37
- RDRVSX32: FAT32 RAM drive for HimemSX - Japheth, 16.03.2022, 07:34
  - RDRVSX32: FAT32 RAM drive for HimemSX - jadoxa, 16.03.2022, 07:51
- another bug in doslfn - Japheth, 19.03.2022, 08:09
  - another bug in doslfn - jadoxa, 19.03.2022, 09:29
    - another bug in doslfn - Japheth, 19.03.2022, 10:35
    - another bug in doslfn - Japheth, 20.03.2022, 08:10
  - another bug in doslfn - jadoxa, 24.03.2022, 13:32
    - another bug in doslfn - Japheth, 25.03.2022, 08:04
      - another bug in doslfn - jadoxa, 26.03.2022, 08:49
        another bug in doslfn - Richard, 27.03.2022, 03:06
        another bug in doslfn - tom, 27.03.2022, 14:41
        another bug in doslfn - jadoxa, 28.03.2022, 05:06
        another bug in doslfn - Richard, 28.03.2022, 06:40
        another bug in doslfn - Richard, 28.03.2022, 07:12
        another bug in doslfn - jadoxa, 28.03.2022, 08:59
        another bug in doslfn - Oso2k, 04.01.2025, 00:41
        another bug in doslfn - jadoxa, 04.01.2025, 06:46
        another bug in doslfn - Oso2k, 04.01.2025, 09:31
        another bug in doslfn - glennmcc, 28.03.2022, 20:26
        another bug in doslfn - Japheth, 27.03.2022, 04:48
        another bug in doslfn - jadoxa, 28.03.2022, 05:08
        about to fix the "final" doslfn bug - Japheth, 29.03.2022, 05:45
        about to fix the "final" doslfn bug - Japheth, 31.03.2022, 22:51
        about to fix the "final" doslfn bug - tom, 01.04.2022, 19:55
        about to fix the "final" doslfn bug - jadoxa, 02.04.2022, 09:55
        about to fix the "final" doslfn bug - Japheth, 03.04.2022, 19:25
        about to fix the "final" doslfn bug - tom, 03.04.2022, 20:25
        about to fix the "final" doslfn bug - Japheth, 04.04.2022, 07:34
        about to fix the "final" doslfn bug - jadoxa, 06.04.2022, 15:05
        about to fix the "final" doslfn bug - Japheth, 06.04.2022, 18:41
        about to fix the "final" doslfn bug - glennmcc, 06.04.2022, 20:18
        about to fix the "final" doslfn bug - jadoxa, 07.04.2022, 03:02
        about to fix the "final" doslfn bug - Japheth, 07.04.2022, 06:58
        about to fix the "final" doslfn bug - Richard, 09.04.2022, 01:11
        about to fix the "final" doslfn bug - Rugxulo, 09.04.2022, 03:38
        about to fix the "final" doslfn bug - Richard, 09.04.2022, 06:15
        about to fix the "final" doslfn bug - jadoxa, 09.04.2022, 12:46
        about to fix the "final" doslfn bug - Richard, 09.04.2022, 20:41
        about to fix the "final" doslfn bug - jadoxa, 10.04.2022, 04:54
        about to fix the "final" doslfn bug - Richard, 10.04.2022, 11:51
        about to fix the "final" doslfn bug - jadoxa, 10.04.2022, 14:42
        about to fix the "final" doslfn bug - Richard, 10.04.2022, 15:43
        about to fix the "final" doslfn bug - tom, 10.04.2022, 22:08
        about to fix the "final" doslfn bug - Richard, 11.04.2022, 04:51
        about to fix the "final" doslfn bug - tom, 10.04.2022, 17:45
        about to fix the "final" doslfn bug - Richard, 10.04.2022, 18:44
        about to fix the "final" doslfn bug - tom, 10.04.2022, 19:51
        about to fix the "final" doslfn bug - Richard, 11.04.2022, 04:05
        about to fix the "final" doslfn bug - jadoxa, 11.04.2022, 05:05
        about to fix the "final" doslfn bug - Richard, 11.04.2022, 07:58
        about to fix the "final" doslfn bug - jadoxa, 11.04.2022, 08:47
        about to fix the "final" doslfn bug - Richard, 11.04.2022, 11:20
        about to fix the "final" doslfn bug - jadoxa, 11.04.2022, 12:05
        about to fix the "final" doslfn bug - Richard, 12.04.2022, 06:03
        about to fix the "final" doslfn bug - jadoxa, 12.04.2022, 10:34
        about to fix the "final" doslfn bug - Richard, 12.04.2022, 11:28
        about to fix the "final" doslfn bug - Japheth, 12.04.2022, 12:35
        about to fix the "final" doslfn bug - Richard, 12.04.2022, 16:28
        about to fix the "final" doslfn bug - Japheth, 12.04.2022, 17:45
        about to fix the "final" doslfn bug - Richard, 13.04.2022, 09:58
        about to fix the "final" doslfn bug - jadoxa, 13.04.2022, 10:33
        about to fix the "final" doslfn bug - Richard, 13.04.2022, 11:07
        about to fix the "final" doslfn bug - Richard, 14.04.2022, 02:19
        about to fix the "final" doslfn bug - Japheth, 14.04.2022, 08:34
        about to fix the "final" doslfn bug - tom, 14.04.2022, 11:42
        about to fix the "final" doslfn bug - jadoxa, 12.04.2022, 16:22
        about to fix the "final" doslfn bug - Japheth, 12.04.2022, 17:37
        thoughts about systematic testing - tom, 12.04.2022, 19:18
        about to fix the "final" doslfn bug - Zyzzle, 13.04.2022, 10:27
        about to fix the "final" doslfn bug - Richard, 13.04.2022, 11:24
        about to fix the "final" doslfn bug - Richard, 13.04.2022, 16:56
        about to fix the "final" doslfn bug - jadoxa, 14.04.2022, 15:23
        about to fix the "final" doslfn bug - Richard, 14.04.2022, 20:49
        about to fix the "final" doslfn bug - jadoxa, 15.04.2022, 04:30
        about to fix the "final" doslfn bug - Richard, 15.04.2022, 06:47
        about to fix the "final" doslfn bug - jadoxa, 15.04.2022, 09:34
        about to fix the "final" doslfn bug - Richard, 17.04.2022, 09:11
        about to fix the "final" doslfn bug - Richard, 17.04.2022, 13:25
        about to fix the "final" doslfn bug - Richard, 17.04.2022, 14:40
        about to fix the "final" doslfn bug - Richard, 19.04.2022, 06:14
        about to fix the "final" doslfn bug - tom, 15.04.2022, 11:32
        about to fix the "final" doslfn bug - jadoxa, 18.04.2022, 10:14
        about to fix the "final" doslfn bug - tom, 18.04.2022, 12:09
        about to fix the "final" doslfn bug - jadoxa, 09.04.2022, 04:29
        about to fix the "final" doslfn bug - Laaca, 11.04.2022, 11:24
        about to fix the "final" doslfn bug - jadoxa, 11.04.2022, 12:15
        released new HimemSX v3.53 on GitHub - Japheth, 09.04.2022, 21:52
        released new HimemSX v3.53 on GitHub - jadoxa, 10.04.2022, 04:56
        perhaps a small bug in new HimemSX? - Japheth, 10.04.2022, 22:04
        perhaps a small bug in new HimemSX? - jadoxa, 11.04.2022, 02:34
        perhaps a small bug in new HimemSX? - Japheth, 11.04.2022, 05:38
        perhaps a small bug in new HimemSX? - Richard, 11.04.2022, 05:58
        perhaps a small bug in new HimemSX? - Japheth, 11.04.2022, 10:07