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Commit 52c48c51 authored by Sascha Silbe's avatar Sascha Silbe Committed by Martin Schwidefsky
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Documentation: document the nosmt and smt s390 kernel parameters 



Commit 6c2ff84e979a ("s390: add SMT support") added the nosmt and smt
early kernel parameters for restricting the use of symmetric
multithreading (SMT). They are quite useful for debugging and testing,
so document them.

Signed-off-by: default avatarSascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 0227f7c4

Documentation/kernel-parameters.txt

+10 −0
Original line number Diff line number Diff line
@@ -2538,6 +2538,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 


	nohugeiomap	[KNL,x86] Disable kernel huge I/O mappings.



	nosmt		[KNL,S390] Disable symmetric multithreading (SMT).

			Equivalent to smt=1.



	noxsave		[BUGS=X86] Disables x86 extended register state save

			and restore using xsave. The kernel will fallback to

			enabling legacy floating-point and sse state.
@@ -3695,6 +3698,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
				1: Fast pin select (default)

				2: ATC IRMode



	smt		[KNL,S390] Set the maximum number of threads (logical

			CPUs) to use per physical CPU on systems capable of

			symmetric multithreading (SMT). Will be capped to the

			actual hardware limit.

			Format: <integer>

			Default: -1 (no limit)



	softlockup_panic=

			[KNL] Should the soft-lockup detector generate panics.

			Format: <integer>