Re: hyper-threading...
On 2018-06-22, Dan Campbell wrote: > Just saw the news about you disabling hyper-threading by default on Intel > CPUs for security reasons, which I agree with. It would be nice to be able > to do this on systems that don't have a toggle for it in the BIOS, as it > increases single-threaded performance. So just wondering when your latest > distro will be coming out with this change, as I see your current version > came out in April? I would like to create a Linux live DVD/flash drive that > I could boot to toggle hyper-threading off on Intel systems running Windows, > or to create a dual-boot situation for those who want to use Linux part-time. > It could also be useful for updating processor microcode, which can't be > done under Windows. Thanks, It doesn't exactly _disable_ hyperthreading, it prevents the scheduler from using more than one "smt cpu" per core. It's not something you can do to affect other OS running on the machine. On Linux you should be able to achieve similar results with the script in https://serverfault.com/a/797534 Seems you might be able to do something similar on Windows using a tool called "process lasso". BTW OpenBSD isn't a Linux distro, it is a completely different operating system.
Re: hyper-threading...
On Fri, 22 Jun 2018 13:18:31 -0700 > The current release (not distro) already has a fix for it: > https://ftp.openbsd.org/pub/OpenBSD/patches/6.3/common/010_intelfpu.patch.sig That is the FPU fix. The hyper threading has landed in current/snapshots but not in stable yet. Also, I expect the code is disabling at the OS level and so will not help other OS, like a bios switch could. The hyper threading performance change may not affect other OS atleast in the same way either.
Re: hyper-threading...
On 22 June 2018 at 13:14, Dan Campbell wrote: > Just saw the news about you disabling hyper-threading by default on Intel > CPUs for security reasons, which I agree with. It would be nice to be able > to do this on systems that don't have a toggle for it in the BIOS, as it > increases single-threaded performance. So just wondering when your latest > distro will be coming out with this change, as I see your current version > came out in April? I would like to create a Linux live DVD/flash drive that > I could boot to toggle hyper-threading off on Intel systems running Windows, > or to create a dual-boot situation for those who want to use Linux part-time. > It could also be useful for updating processor microcode, which can't be > done under Windows. Thanks, > The current release (not distro) already has a fix for it: https://ftp.openbsd.org/pub/OpenBSD/patches/6.3/common/010_intelfpu.patch.sig Download 6.3 run syspatch, which will fetch all available patches for 6.3: https://www.openbsd.org/errata63.html > Dan -- --- inum: 883510009027723 sip: jungleboo...@sip2sip.info
hyper-threading...
Just saw the news about you disabling hyper-threading by default on Intel CPUs for security reasons, which I agree with. It would be nice to be able to do this on systems that don't have a toggle for it in the BIOS, as it increases single-threaded performance. So just wondering when your latest distro will be coming out with this change, as I see your current version came out in April? I would like to create a Linux live DVD/flash drive that I could boot to toggle hyper-threading off on Intel systems running Windows, or to create a dual-boot situation for those who want to use Linux part-time. It could also be useful for updating processor microcode, which can't be done under Windows. Thanks, Dan
