From ac66a73be03a0a72aeeb33d3610cfc43cb101a0b Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Wed, 25 Mar 2026 16:01:47 -0700 Subject: x86/fred: Enable FRED by default When FRED was added to the mainline kernel, it was set up as an explicit opt-in due to the risk of regressions before hardware was available publicly. Now, Panther Lake (Core Ultra 300 series) has been released, and benchmarking by Phoronix has shown that it provides a significant performance benefit on most workloads: https://www.phoronix.com/review/intel-fred-panther-lake Accordingly, enable FRED by default if the CPU supports it. FRED can of course still be disabled via the fred=off command line option. Touch up Kconfig help too. Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Sohil Mehta Link: https://patch.msgid.link/20260325230151.1898287-2-hpa@zytor.com --- Documentation/admin-guide/kernel-parameters.txt | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'Documentation') diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 03a550630644..bfa8a20ccc37 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1750,8 +1750,8 @@ Kernel parameters fred= [X86-64] Enable/disable Flexible Return and Event Delivery. Format: { on | off } - on: enable FRED when it's present. - off: disable FRED, the default setting. + on: enable FRED when it's present, the default setting. + off: disable FRED. ftrace=[tracer] [FTRACE] will set and start the specified tracer -- cgit v1.2.3