Comments on: Meltdown and Spectre and DragonFly https://www.dragonflydigest.com/2018/01/05/meltdown-and-spectre-and-dragonfly/ A running description of activity related to DragonFly BSD. Mon, 08 Jan 2018 04:18:19 +0000 hourly 1 https://wordpress.org/?v=6.9.4 By: Anonymous https://www.dragonflydigest.com/2018/01/05/meltdown-and-spectre-and-dragonfly/comment-page-1/#comment-487104 Mon, 08 Jan 2018 04:18:19 +0000 https://www.dragonflydigest.com/?p=20672#comment-487104 Thanks for introducing the sysctl machdep.isolated_user_pmap. I can imagine many cases of a server running 100% trusted code and not wanting to take factor of three slowdown in the system calls mechanism.

For desktop systems, if isolated_user_pmap could be implemented per process, then the trusted part of user land could run full speed and with only the untrusted code, for example web assembly in a browser, experiencing a slowdown from the mitigation.

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