On Sun, Feb 17, 2019 at 04:01:36PM +0500, Roman Mamedov wrote: > On Thu, 14 Feb 2019 18:02:26 +0000 > Lee Yates <rainmaker...@icloud.com> wrote: > > Sorry, hit "send" before reading the rest of your message. > > > the router runs headless and is awkward to get a monitor to so I can access > > the BIOS. > > You can toggle it without needing the BIOS. > It is possible to disable SMT from grub, with Linux kernel boot arguments. > It even seems possible to disable/enable it without a reboot. > See https://www.golinuxhub.com/2018/01/how-to-disable-or-enable-hyper.html
Hi all. The information provided by the original link is out-of-date, it works, but it's tedious and easy to make a mistake and disable the wrong logical CPU. The new Linux kernel with L1TF fixes has introduced a SMT kill switch, which is the standard interface to control SMT. It's located at /sys/devices/system/cpu/smt/control You can disable SMT by, echo "off" > /sys/devices/system/cpu/smt/control enable it by, echo "on" > /sys/devices/system/cpu/smt/control Or permanently disable it until reboot, echo "forceoff" > /sys/devices/system/cpu/smt/control. More information is available at, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/l1tf.rst I hope it helps. Cheers, Tom Li _______________________________________________ WireGuard mailing list WireGuard@lists.zx2c4.com https://lists.zx2c4.com/mailman/listinfo/wireguard