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    SubjectRe: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lock if possible
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    On Fri, 2011-03-25 at 10:38 +0100, Eric Dumazet wrote:
    >
    > BIOS : Version: I27 Release Date: 09/30/2010
    >
    > [ 0.021849] CPU0: Intel(R) Xeon(R) CPU E5640 @ 2.67GHz stepping 02
    > [ 0.123904] Performance Events: PEBS fmt1+, Westmere events, Broken BIOS detected, using software events only.
    > [ 0.124125] [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 38d is 330)

    Do the below instructions yield a working system?:

    > > On the BL460c G6/G7, one could perform the following steps:
    > >
    > > To configure BIOS low-latency options using RBSU
    > > 1. Press F9 during POST to enter RBSU.
    > > 2. Press CTRL-A to open the menu.
    > > 3. Select Service Options.
    > > 4. Disable either or both of the following options:
    > > o Processor Power and Utilization Monitoring
    > > o Memory Pre-Failure Notification
    > >
    > > By doing the above the BIOS should release the performance counter, and the
    > > kernel's "perf" should not encounter a conflict.
    > >
    > > The document that you are looking for is here: (please see page 8 and later):
    > > http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01804533/c01804533.pdf





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