SSE2 kernel Semthex please read this

[spreaderb]

Hi,

 

Since 3 weeks I have the 10.4.8 running on a P4 Northwood (Intel 865PE Chipset, Nvidia 6200 GPU) running stable using the Jas 10.4.8 SSE2 SSE3 AMD Intel iso

 

I want to use this oppotunity to thank Jas and Semthex for the terrific job to provide this to the community. It is just amazing how good OSX feels on a former XP machine. Especially the job Semthex did with the SSE2 Emulation on a SSE2 machine is fantastic.

 

There is just one thing I found out which I want to discuss here. When I use iDVD I see a very interesting effect which is probably related to the SSE3 emulation on SSE2 machines.

As you know iDVD uses SSE3 heavily to render all the chapter effects in the provided templates. When I start the preview I get smoth effects for 3 seconds and after that iDVD is literally crawling. The same happens when you try to render the final disc there is full speed for 3 seconds and then it takes a ridiculous amount of time to even render one menu while CPU usage is at 100%

 

To me it looks like the SSE2 implemetation works well until some buffer is full and after this the performance of the SSE2 emulation drops extremely. As long as there are only very few SSE3 statements to process this will work perfectly but if there are apps like iDVD or DVD Player with a high frequent use of SSE3 statements the emulation has a severe performance issue.

 

Hi semthex does this comment make any sense to you and if yes do you see a chance to improve this?

 

kind regards

Chris

Edited February 9, 2007 by spreaderb

[Sailfish]

Post this to http://forum.insanelymac.com/index.php?showtopic=32827

 

Go to IRC in the evening (US) for best chance of live help.