hyper threading

Not yet

Blog post by axeld on Thu, 2005-10-27 00:41
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As I advertised yesterday, I had a short look at hyper threading today. Well, that short look was actually a bit longer than what I hoped for - and it even still doesn't work.

While starting up the second logical processor is working almost fine - for some reason it needs some longer timeouts between the initialization commands - I get no interrupts anymore, when both processors are running. Have I said none? Not true, as the inter-CPU messages (which are interrupt based) are still working. But even the APIC timers don't trigger an interrupt anymore (the timer interrupt is what makes the CPU switch to another thread from time to time).

Hyper Threading?

Blog post by axeld on Tue, 2005-10-25 23:03
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Tomorrow, I'll have a short look at implementing Hyper Threading support - not the full monty, but it would still be nice to have it start using the two logical processors in my system; after all, I bought this system with enabling Hyper Threading in Haiku in mind.

After that excursion, I will start looking at the app_server again. I had started to refactor the code some weeks ago, but got interrupted, and didn't find the time to continue this effort. I hope to make the app_server stable in the next few weeks - it's one of the biggest show stoppers for Haiku right now: the kernel should decide when the time for a reboot has come (read KDL), not some bloody userland application :-)

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