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2012 Feb 14
3
ftrace_enabled set to 1 on bootup, slow downs with CONFIG_FUNCTION_TRACER in virt environments?
Hey,
I was running some benchmarks (netserver/netperf) where the init script just launched
the netserver and nothing else and was concerned to see the performance not up to par.
This was an HVM guest running with PV drivers.
If I compile the kernel without CONFIG_FUNCTION_TRACER it is much better - but it was
my understanding that the tracing code does not impact the machine unless it is enabled.
And when I inserted a bunch of print_dump_bytes I do see instructions such as
e8 6a 90 60 e1 get replaced with 66 66 66 90 so I see the the instructions getting
patched over.
T...