Hyper X Posted December 16, 2007 Share Posted December 16, 2007 I am running a Prescott 2.8 GHZ SSE3 HT processor on an Intel 875PBZ motherboard. I am running Leopard 10.5.1 with TOH 9.1 Kernel on PCEFI v8.0 When HT is set to off or cpus=1 it boots fine. But with HT enabled I get a Kernel Panic. Can anyone help? Sorry about the sloppy writing. I broke my right wrist :/ Link to comment Share on other sites More sharing options...
Bimmer Posted December 16, 2007 Share Posted December 16, 2007 sorry, i can't help you with your problem, i have the same problem, but how did you get PCEFI working? Link to comment Share on other sites More sharing options...
DieMe Posted December 17, 2007 Share Posted December 17, 2007 you get the panic screen no prob, boot up your computer repetitively pressing F8 till you get a black screen waiting for you to type something type in -legacy and no more panic but u need to do this all the time you boot ur comp to auto boot u need uphuck Tiger install disk to get the apple.boot or something like that to get outoboot Link to comment Share on other sites More sharing options...
Korrupted Posted December 17, 2007 Share Posted December 17, 2007 Why not just turn HTT off? It's not that great anyway. On my old P4 box(still in sig at the top), I had it on for a while, but then turned it off since there was basically no performance gain that I noticed. Link to comment Share on other sites More sharing options...
Hyper X Posted December 17, 2007 Author Share Posted December 17, 2007 sorry, i can't help you with your problem, i have the same problem, but how did you get PCEFI working? I followed this guide. It worked well! you get the panic screen no prob, boot up your computer repetitively pressing F8 till you get a black screen waiting for you to type something type in -legacy and no more panic but u need to do this all the time you boot ur comp to auto boot u need uphuck Tiger install disk to get the apple.boot or something like that to get outoboot -legacy doesn't help one way or another. It seems unneeded. Why not just turn HTT off? It's not that great anyway. On my old P4 box(still in sig at the top), I had it on for a while, but then turned it off since there was basically no performance gain that I noticed. Other people have said it works well. I could leave it off but it's not a 100% till those last few issues get fixed Link to comment Share on other sites More sharing options...
more or less Posted December 17, 2007 Share Posted December 17, 2007 I am running a Prescott 2.8 GHZ SSE3 HT processor on an Intel 875PBZ motherboard. I am running Leopard 10.5.1 with TOH 9.1 Kernel on PCEFI v8.0 When HT is set to off or cpus=1 it boots fine. But with HT enabled I get a Kernel Panic. Can anyone help? Sorry about the sloppy writing. I broke my right wrist :/ Are you using the vanilla kernel? After I upgraded to 10.5.1 on my 3.0HT I had so many issues I freaking just went back to 10.5.0. Try the mach_sleep ToH kernel. Or, disable it in bios. Even if you are "threading" to two CPUs, you still really have only one processing core. HT is not so much about speed, but stability and maximizing the CPU. Frankly, I'd have to think that OS X does a good job on its own, assuming you'd rather stick to the vanilla kernel. You may also need to delete that IntelCPUManagement kext that was likely re-installed in your system. Try that first if its in there... Link to comment Share on other sites More sharing options...
meww Posted December 17, 2007 Share Posted December 17, 2007 here follow this guide and it should work http://forum.osx86scene.com/viewtopic.php?f=16&t=2727 make sure u backup AppleSMBIOS.kext and Powermanagemtbundle so if you mess up u can go back and fix it Link to comment Share on other sites More sharing options...
macbrush Posted December 17, 2007 Share Posted December 17, 2007 I would just turn it off. I tested some apps with my P4 3GHz, there is absolutely no performance gain with multi-threaded apps w/ HT turned on, but there is quite a bit of performance loss with single threaded apps w/ HT turned on. Link to comment Share on other sites More sharing options...
Hyper X Posted December 22, 2007 Author Share Posted December 22, 2007 I just left it at cpus=1 and this seems to be working ok! Guess i should be happy with a working hack Link to comment Share on other sites More sharing options...
Synaesthesia Posted December 30, 2007 Share Posted December 30, 2007 I don't know, I had to disable Hyperthreading on my P4 3ghz HT because otherwise it stutters badly. (Intel 945GTP motherboard) But it's working perfectly on my friend's rig, which uses a Foxconn p4m800 motherboard. I will try the OSX86 scene guide to get it working because I believe it works faster with HT (maybe just an illusion) Link to comment Share on other sites More sharing options...
Synaesthesia Posted December 31, 2007 Share Posted December 31, 2007 BTW if anyone still cares, removing AppleIntelPowerManagement.kext allowed me to run Leopard with HyperThreading Link to comment Share on other sites More sharing options...
Hyper X Posted December 31, 2007 Author Share Posted December 31, 2007 BTW if anyone still cares, removing AppleIntelPowerManagement.kext allowed me to run Leopard with HyperThreading I removed mine a while ago and it was still a no go :/ Link to comment Share on other sites More sharing options...
Synaesthesia Posted January 2, 2008 Share Posted January 2, 2008 I actually put it back onto single threaded / no HT, as it seems more stable (was getting kernel panics), and there's no speed difference to my eyes! Link to comment Share on other sites More sharing options...
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