A Look At The Meltdown Performance Impact With DragonFlyBSD 5.2
Written by Michael Larabel in BSD on 15 April 2018 at 11:15 AM EDT. 6 Comments
BSD --
Besides looking at the HAMMER2 performance in DragonFlyBSD 5.2, another prominent change with this new BSD operating system release is the Spectre and Meltdown mitigations being shipped. In this article are some tests looking at the performance cost of DragonFlyBSD 5.2 for mitigating the Meltdown Intel CPU vulnerability.

With DragonFlyBSD 5.2 there is the machdep.meltdown_mitigation sysctl for checking on the Meltdown mitigation presence and toggling it. Back in January we ran some tests of DragonFlyBSD's Meltdown mitigation using the page table isolation approach while now testing was done using the DragonFlyBSD 5.2 stable release.

This round of weekend benchmarking was looking at the impact with/without Meltdown mitigation using an Intel Xeon E3-1280 v5 Skylake workstation.

Benchmarking, as always, was done by the Phoronix Test Suite.

With tests relying upon heavy I/O or kernel interactivity, the impact is quite apparent as we have already shown from extensive testing on Linux and Windows. A Linux vs. BSD vs. Windows comparison will be coming up soon looking at the relative difference on each platform.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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