• Tim Hockin's avatar
    [PATCH] x86-64: Dynamically adjust machine check interval · 8a336b0a
    Tim Hockin authored
    Background:
     We've found that MCEs (specifically DRAM SBEs) tend to come in bunches,
     especially when we are trying really hard to stress the system out.  The
     current MCE poller uses a static interval which does not care whether it
     has or has not found MCEs recently.
    
    Description:
     This patch makes the MCE poller adjust the polling interval dynamically.
     If we find an MCE, poll 2x faster (down to 10 ms).  When we stop finding
     MCEs, poll 2x slower (up to check_interval seconds).  The check_interval
     tunable becomes the max polling interval.  The "Machine check events
     logged" printk() is rate limited to the check_interval, which should be
     identical behavior to the old functionality.
    
    Result:
     If you start to take a lot of correctable errors (not exceptions), you
     log them faster and more accurately (less chance of overflowing the MCA
     registers).  If you don't take a lot of errors, you will see no change.
    
    Alternatives:
     I considered simply reducing the polling interval to 10 ms immediately
     and keeping it there as long as we continue to find errors.  This felt a
     bit heavy handed, but does perform significantly better for the default
     check_interval of 5 minutes (we're using a few seconds when testing for
     DRAM errors).  I could be convinced to go with this, if anyone felt it
     was not too aggressive.
    
    Testing:
     I used an error-injecting DIMM to create lots of correctable DRAM errors
     and verified that the polling interval accelerates.  The printk() only
     happens once per check_interval seconds.
    
    Patch:
     This patch is against 2.6.21-rc7.
    Signed-Off-By: default avatarTim Hockin <thockin@google.com>
    Signed-off-by: default avatarAndi Kleen <ak@suse.de>
    8a336b0a
mce.c 18.4 KB