Date: Wed, 23 Oct 2024 10:38:12 -0400 From: gnn <gnn@freebsd.org> To: Arch <freebsd-arch@freebsd.org> Subject: Building kernels with FPU support? Message-ID: <E37A7972-7FBE-4428-81E1-8DC6D0F67726@freebsd.org>
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Howdy, I am wondering if anyone has tried, lately, to see what effect building with FPU support has on overall system performance. I've been working with a kernel module that needs this (for reasons I'll not go into now) and it occurred to me that the perceived performance overhead that caused us to only do fixed point in the kernel may no longer be significant. I note that Linux has an option to build their kernel with FPU support. And yes, I know that we have the ability to selectively deal with the FPU, from the calls outlined in Section 9 for fpu, but I'm asking the more general question of "does it matter?" and "if so, how much?" Best, Georgehelp
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