Low-latency kernel patch instructions


In most cases, uClinux provides excellent real time performance simply
due to the bounded nature of the embedded environment it is hosting.
However, the kernel low latency patch is included to further enhance
system determinism.  This patch adds scheduling points to several kernel
loops that have been found to increase latency under various loads.
The main advantage of this approach is that it improves latency without
requiring changes to hosted applications.


To use the low latency patch, perform the following steps.

1.  Change to the kernel source directory:
	cd uClinux-dist/linux-2.4.x

2.  Apply the low latency patch:
	patch -p1 < low-latency-frio-4.patch

3.  Turn on the low latency scheduling feature using "make xconfig"
	Target Platform Selection
	Customize Kernel Settings
	Main Menu
	Save and Exit
	Processor type and features
	Enable Low latency scheduling
	(leave 'Control low latency with sysctl' turned off)
	
4.  Build and deploy the system image.

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