I am wondering if increasing the ECC scrub rate with nvramcui will improve rowhammer protection on the various coreboot fam15h boards, and if there is any downside to putting it at the fastest setting. Default is 640ns but it can go down to 40ns.
I know that laptop memory is very vulnerable to this, but that desktop/server memory isn't as much due to the lower density however server RAM has high density assuming you have the elite 16 and 32gb sticks etc.
At least there is this: “…Intel chips were 200x more likely to have bitflips than AMD processors, and the team wants to explore this further.” dat magny coars <3
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On 02/12/2017 05:49 PM, Taiidan@gmx.com wrote:
I am wondering if increasing the ECC scrub rate with nvramcui will improve rowhammer protection on the various coreboot fam15h boards, and if there is any downside to putting it at the fastest setting. Default is 640ns but it can go down to 40ns.
In general, no. You either have rowhammer protection in terms of DIMMs that are very unlikely to flip, in which case standard ECC will help, or you have DIMMs that will generally flip even before ECC scrub can "fix" the errors.
With ECC in general, the most likely result of a successful rowhammer-based bit flip is a double fault found during scrub, with a subsequent machine reset.
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