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x86/fred: Enable FRED by default

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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) <hpa@zytor.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
Link: https://patch.msgid.link/20260325230151.1898287-2-hpa@zytor.com
This commit is contained in:
H. Peter Anvin
2026-03-25 16:01:47 -07:00
committed by Borislav Petkov (AMD)
parent c369299895
commit ac66a73be0
3 changed files with 4 additions and 4 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
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@@ -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