Comments on: Degrading qemu performance in DooM Part II https://virtuallyfun.com/2019/03/15/degrading-qemu-performance-in-doom-part-ii/ Fun with Virtualization Fri, 26 Jul 2019 10:13:36 +0000 hourly 1 https://wordpress.org/?v=7.0.1 By: neozeed https://virtuallyfun.com/2019/03/15/degrading-qemu-performance-in-doom-part-ii/comment-page-1/#comment-217748 Fri, 26 Jul 2019 10:13:36 +0000 https://virtuallyfun.com/wordpress/?p=9280#comment-217748 In reply to Martin Buriánek.

It was standard versions of qemu. The older stuff is more responsive on Windows… That’s all.

I’ve been experimenting on and off here:
https://sourceforge.net/projects/qemu090b/

The most interesting thing was Mpu401 Io support… If you like DOS MIDI.

https://sourceforge.net/p/crossdjgppv1/DooM/ci/master/tree/

This is an experiment with doom, getting it to build with various compilers etc..

The main issue at hand is the watcom retail doom has self modifying code that kills the newer qemu dynamic translations, although the newer ones fare much better, the graphics Io seems to lag.. Maybe it’s my perception I haven’t measured

]]> By: Martin Buriánek https://virtuallyfun.com/2019/03/15/degrading-qemu-performance-in-doom-part-ii/comment-page-1/#comment-217659 Thu, 25 Jul 2019 19:30:55 +0000 https://virtuallyfun.com/wordpress/?p=9280#comment-217659 In reply to neozeed.

Hi, nice projekt!!. Please can you describe it more? So you modified the source for Doom and compiled, or did you make some modifications to the new versions of QEMU, and that’s why it’s running well now? If you have made changes to QEMU, please describe it or post diff for version 20190218 thank you in advance

]]> By: neozeed https://virtuallyfun.com/2019/03/15/degrading-qemu-performance-in-doom-part-ii/comment-page-1/#comment-209979 Mon, 18 Mar 2019 23:47:48 +0000 https://virtuallyfun.com/wordpress/?p=9280#comment-209979 In reply to Stefan Ring.

I’m using a 13 year old machine, so I’m sure you have something faster.

Also this is part 2, did you see part 1?

The whole point was Watcom/C and the self-modifying code vs using a GCC build with no self modifying code, along with performance timings of an ASM version of FixedDiv/FixedMul vs using a C version.

]]> By: Stefan Ring https://virtuallyfun.com/2019/03/15/degrading-qemu-performance-in-doom-part-ii/comment-page-1/#comment-209970 Mon, 18 Mar 2019 20:39:06 +0000 https://virtuallyfun.com/wordpress/?p=9280#comment-209970 How is this degrading? It has been constantly improving since 0.11.0. Also, the prebuilt ones are much faster than your own builds, for whatever reason.

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