DOS ain't dead - another regression in 0.10.0

another regression in 0.10.0 (Announce)

posted by rr , Berlin, Germany, 23.03.2009, 22:45

> There's another regression in 0.10.0 concerning Ultra-DMA: if JLM
> XDMA32.DLL is loaded, option /B must be used.

Why do you think so? What's the problem w/o "/B"? I didn't experience any problems here (MS-DOS 6.22, just JemmEx 5.72).

> The speed differences are significant. Some results with IDECHECK, which

QEMU's HDD speed nicely scales with CPU performance.

> reads HDs with Int 13h (using an 200MB image):
>
> - no XDMA32.DLL loaded: ~ 25 MB/sec
> - XDMA32.DLL /B ~ 73 MB/sec
> - XDMA32.DLL ~ 130 MB/sec
>
> With Qemu v0.91, XDMA32.DLL without option /B worked - and was even faster
> than with v0.10.0: ~ 195 MB/sec.

Some figures:

version 0.10.0:
vmdk 600 MHz SmartDrv 10 MB/s clean 12.5 MB/s 1.5 GHz 32.4 MB/s raw 1.5 GHz 29.4 MB/s vmdk 600 MHz XDMA32 113 MB/s 1.5 GHz 217 MB/s

version 0.9.1:
vmdk 1.5 GHz XDMA32 409 MB/s

So QEMU 0.10.0 is only half as fast as QEMU 0.9.1. :-|

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Complete thread:

QEMU 0.10.0 available - rr, 05.03.2009, 22:25 (Announce)
- QEMU 0.10.0 available - rr, 06.03.2009, 23:09
  - QEMU 0.10.0 available - Japheth, 07.03.2009, 03:57
    - QEMU 0.10.0 available - rr, 07.03.2009, 18:27
      - QEMU 0.10.0 available - Japheth, 08.03.2009, 11:20
  - QEMU 0.10.0 available - rr, 07.03.2009, 21:08
    - QEMU 0.10.0 available - Ruslan, 10.03.2009, 19:00
      - QEMU 0.10.0 available - Rugxulo, 10.03.2009, 23:05
        QEMU 0.10.0 available - rr, 11.03.2009, 14:37
      - QEMU 0.10.0 available - rr, 11.03.2009, 14:45
        QEMU 0.10.0 available - Ruslan, 11.03.2009, 18:36
        QEMU 0.10.0 available - rr, 11.03.2009, 22:55
        QEMU 0.10.0 available - rr, 11.03.2009, 23:10
        QEMU 0.10.0 available - Ruslan, 12.03.2009, 11:35
        QEMU 0.10.0 available - Khusraw, 12.03.2009, 12:21
        QEMU 0.10.0 available - rr, 12.03.2009, 13:15
        QEMU 0.10.0 available - Khusraw, 12.03.2009, 13:20
        QEMU 0.10.0 available - rr, 12.03.2009, 13:25
        QEMU 0.10.0 available - Ruslan, 12.03.2009, 22:07
        QEMU 0.10.0 available - rr, 12.03.2009, 22:21
        QEMU 0.10.0 available - rr, 12.03.2009, 22:54
        QEMU 0.10.0 available - Ruslan, 17.03.2009, 12:28
        QEMU 0.10.0 available - rr, 17.03.2009, 13:33
        QEMU 0.10.0 available - Ruslan, 17.03.2009, 16:35
        QEMU 0.10.0 available - rr, 17.03.2009, 21:20
        QEMU 0.10.0 available - rr, 17.03.2009, 23:11
        QEMU 0.10.0 available - rr, 18.03.2009, 23:08
        QEMU 0.10.0 available - Ruslan, 12.03.2009, 22:23
        QEMU 0.10.0 available - rr, 12.03.2009, 23:01
        QEMU 0.10.0 available - rr, 12.03.2009, 13:17
  - QEMU 0.10.0 available - RayeR, 08.03.2009, 15:51
    - QEMU 0.10.0 available - Rugxulo, 09.03.2009, 00:29
      - QEMU 0.10.0 available - rr, 09.03.2009, 20:24
        QEMU 0.10.0 available - Rugxulo, 10.03.2009, 01:29
        QEMU 0.10.0 available - rr, 10.03.2009, 08:55
        QEMU 0.10.0 available - rr, 11.03.2009, 23:23
    - QEMU 0.10.0 available - rr, 09.03.2009, 20:21
- Regression in 010 - Japheth, 13.03.2009, 10:27
  - Regression in 010 - Ruslan, 13.03.2009, 17:29
  - Regression in 010 - rr, 16.03.2009, 22:47
    - Regression in 010 - rr, 17.03.2009, 13:44
- QEMU 0.10.0 available + TCG + TCC - DOS386, 15.03.2009, 02:17
  - QEMU 0.10.0 available + TCG + TCC - Rugxulo, 15.03.2009, 16:09
  - QEMU 0.10.0 available + TCG + TCC - rr, 15.03.2009, 22:03
- QEMU 0.10.0 available - rr, 17.03.2009, 22:55
  - QEMU 0.10.0 available - Japheth, 18.03.2009, 10:07
    - QEMU 0.10.0 available - rr, 18.03.2009, 11:45
      - QEMU 0.10.0 available - Japheth, 18.03.2009, 12:24
        QEMU 0.10.0 available - rr, 18.03.2009, 23:06
      - QEMU 0.10.0 available - RayeR, 18.03.2009, 22:40
      - QEMU 0.10.0 available - Japheth, 19.03.2009, 05:58
        QEMU 0.10.0 available - rr, 19.03.2009, 09:09
        QEMU 0.10.0 available - Japheth, 19.03.2009, 17:20
        QEMU 0.10.0 available - rr, 19.03.2009, 20:55
        QEMU 0.10.0 available - RayeR, 20.03.2009, 12:13
- QEMU 0.10.0 available - rr, 20.03.2009, 23:01
  - QEMU 0.10.0 available - Japheth, 21.03.2009, 07:03
    - QEMU 0.10.0 available - rr, 22.03.2009, 22:18
- another regression in 0.10.0 - Japheth, 21.03.2009, 11:53
  - another regression in 0.10.0 - rr, 22.03.2009, 22:21
    - another regression in 0.10.0 - Japheth, 22.03.2009, 22:31
      - another regression in 0.10.0 - rr, 22.03.2009, 22:56
  - another regression in 0.10.0 - rr, 23.03.2009, 22:45
    - another regression in 0.10.0 - Japheth, 24.03.2009, 03:50
      - another regression in 0.10.0 - rr, 24.03.2009, 21:57
        another regression in 0.10.0 - Japheth, 25.03.2009, 08:47
- Forward to the past ... v0.9.1 - Japheth, 23.03.2009, 10:05
  - Forward to the past ... v0.9.1 - rr, 23.03.2009, 22:47
    - Forward to the past ... v0.9.1 - Japheth, 24.03.2009, 03:55
      - Forward to the past ... v0.9.1 - rr, 24.03.2009, 22:01