Re: Status of hyperthreading in FreeBSD

2008-12-22 Thread Wojciech Puchar
Atom's HTT is actually pretty good - I saw up to 25% more performance simply by using multithreading in 7zip's compression benchmark (on WinXP, though). Of course, OTOH it uses about that much more transistors on the CPU die so it's not exactly free performance. really that much? i thought

Re: Status of hyperthreading in FreeBSD

2008-12-22 Thread Ivan Voras
Sam Fourman Jr. wrote: as far as i know, just enabling smp will allow ht to function. also, i don't know if intel changed ht in the new atom processor, they could have. is FreeBSD's smp special in some way that it would be the exception to the following statement. I know there was a lot of

Re: Status of hyperthreading in FreeBSD

2008-12-22 Thread Ivan Voras
Wojciech Puchar wrote: Atom's HTT is actually pretty good - I saw up to 25% more performance simply by using multithreading in 7zip's compression benchmark (on WinXP, though). Of course, OTOH it uses about that much more transistors on the CPU die so it's not exactly free performance.

Re: Status of hyperthreading in FreeBSD

2008-12-21 Thread Ivan Voras
Brett Glass wrote: Which raises a question: What's the status of FreeBSD's support for hyperthreading? As far as I know, after it was revealed that some processes on a machine with hyperthreading could spy on others, and Yes, but that is a hardware problem which is independent of the

Re: Status of hyperthreading in FreeBSD

2008-12-21 Thread Sam Fourman Jr.
as far as i know, just enabling smp will allow ht to function. also, i don't know if intel changed ht in the new atom processor, they could have. is FreeBSD's smp special in some way that it would be the exception to the following statement. I know there was a lot of changes made in the new

Status of hyperthreading in FreeBSD

2008-12-20 Thread Brett Glass
Netbooks based on Intel's Atom microprocessor are turning into big hits this Christmas season. The Atom, a super-low-power x86 processor, is an in-order machine, which means that except for a few special cases it can spend a lot of time waiting for data to arrive when it encounters a cache

Re: Status of hyperthreading in FreeBSD

2008-12-20 Thread michael
Brett Glass wrote: Netbooks based on Intel's Atom microprocessor are turning into big hits this Christmas season. The Atom, a super-low-power x86 processor, is an in-order machine, which means that except for a few special cases it can spend a lot of time waiting for data to arrive when it

Re: Status of hyperthreading in FreeBSD

2008-12-20 Thread Wojciech Puchar
Netbooks based on Intel's Atom microprocessor are turning into big hits this Christmas season. The Atom, a super-low-power x86 processor, is an in-order machine, which means that except for a few special cases it can spend a lot of time waiting for data to arrive when it encounters a cache