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I try to disable haswell cache prefetcher, but there is no options in the BIOS. I also try to use wrmsr command to set 0x1a0 register the bit 9 to be 1 to disable the cache prefetcher, but failed.
# rdmsr 0x1a0
850089
#wrmsr -p 0 0x1a0 0x850289
wrmsr: CPU 0 cannot set MSR 0x000001a0 to 0x0000000000850289
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Do you use Linux or Windows
Sometimes write/read operations on MSR registers are locked.I had similar issue with access to MSR 0x199.
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What flags (bits number) are you trying to change in MSR?
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I was using windbg to modify MSR registers.
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