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Re:Google says Rowhammer attacks are gaining range as RAM is... by Dylan16807 on Saturday May 29, 2021 @02:05AM (#27323373)
> I'm sure that either it or phenomenon like it are the causes of a lot of odd "glitchy" behaviour that people encounter, because systems are run so close to their limits that there are bound to be cases when they surpass the limits.

I don't know about that. Rowhammer really emphasizes the hammer. A normal read pattern will basically never hit the lines in a small area that much, it will hit cache instead.

> Now you've turned specific access patterns into "attack attempts", and by discriminating against them as such, entirely destroyed a fundamental part of general-purpose computing.

Can you show me any code that causes this kind of access pattern that wasn't deliberately designed to implement rowhammer?

> Where manufacturers are trying to sell 2-4x the capacity with 1/4 to 1/16th of the endurance?

We could go the other way too and glue together multiple SLC cells to increase endurance and cost. Are you claiming there is a specific correct amount of endurance? Because "as much as possible" isn't feasible and "as much as SLC used to have" could only be correct from an extreme coincidence or from conflating nostalgia with correctness. Is there a different number you have in mind?

> This problem didn't exist 15 years ago. It only got created because the RAM companies have forsaken correctness, and somehow managed to convince everyone else that it's not their own fault.

Old ram had errors too. RAM companies can and should put in mechanisms to prevent rowhammer, but if I was buying a stick of ram and had a choice between ECC and perfect rowhammer prevention I'd choose ECC.

Re:Google says Rowhammer attacks are gaining range as RAM is... by metiscus on Saturday May 29, 2021 @03:44AM (#27323696)
What if the choice was between a normal stick of ram and a row hammer mitigated stick with double the CAS timing and that cost 50% more? I guess my point is, considering how fundamental to the design and physics of ram, it is unlikely any product designed to mitigate the problem would be equally performant or economic, at least in a medium timeframe.
Re:Google says Rowhammer attacks are gaining range as RAM is... by Dylan16807 on Saturday May 29, 2021 @04:22AM (#27323832)
I'm much more optimistic. Use target row refresh but do it right. Very low silicon cost, low performance cost under malicious loads, zero performance cost under non-malicious loads.