Lzdoom on a s478 celeron 1.7, is this level of performance surprising?

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invictius
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Lzdoom on a s478 celeron 1.7, is this level of performance surprising?

Post by invictius »

With a gtx 560 - the latest 32 bit gz was getting 3-8fps in doom 2 map 1 at 320x200. 1.8.6 was a lot better but horribly unstable. With lz and the same setting, I get over 30 - up to about 60 from memory. (Btw gles didn't help on gz) I know lz is for older systems, but surely that doesn't mean a 22 year old cpu? Of course in both ports, the cpu usage is 100% all the time. I also thought a cpu bottleneck meant that you'd get stuttering but I didn't notice any. As for why I'm using a gtx 560? I wanted to experiment with cpu bottlenecks and it's the highest spec card that I 1) own and 2) will work on this ancient board that for some reason has a pcie slot (Bought it especially for running video cards with opengl 3.3+, which rules out most agp cards, and the agp cards that do have it, are ridiculously expensive)
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Graf Zahl
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Re: Lzdoom on a s478 celeron 1.7, is this level of performance surprising?

Post by Graf Zahl »

This kind of CPU was where I started developing GZDoom, albeit with much older GPUs and back in the day the game was playable at 35 fps at 640x480 (this was from before interpolation got added.) Those 3 fps seem a bit weird - as if OpenGL was emulated for some reason.
invictius
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Re: Lzdoom on a s478 celeron 1.7, is this level of performance surprising?

Post by invictius »

Graf Zahl wrote: Sat Apr 15, 2023 8:26 am This kind of CPU was where I started developing GZDoom, albeit with much older GPUs and back in the day the game was playable at 35 fps at 640x480 (this was from before interpolation got added.) Those 3 fps seem a bit weird - as if OpenGL was emulated for some reason.
Would dynamic lights have contributed to it? Though I'm sure I tried it with them off as well. Maybe the system couldn't handle the opengl features that lz cuts out? Seeing the card is opengl 4.6, maybe all those fancy features that 3.3 lacks was taxing the system as a whole.
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Graf Zahl
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Re: Lzdoom on a s478 celeron 1.7, is this level of performance surprising?

Post by Graf Zahl »

Unlikely. The 560 is good enough that the system would be free of GPU stalls. Something must go wrong on the CPU side and a 90% performance drop hints at some emulation path being hit,
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Re: Lzdoom on a s478 celeron 1.7, is this level of performance surprising?

Post by drfrag »

I've seen that with some old nvidia opengl drivers but AFAIR it was with a geforce fx.
invictius
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Re: Lzdoom on a s478 celeron 1.7, is this level of performance surprising?

Post by invictius »

Graf Zahl wrote: Sat Apr 15, 2023 11:15 am Unlikely. The 560 is good enough that the system would be free of GPU stalls. Something must go wrong on the CPU side and a 90% performance drop hints at some emulation path being hit,
Is there anything I can run/that you would want me to run in order to see if that's the case?

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