seoaeu · HackerTrans

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My estimate is for a small number of contiguous regions. It is true that if you adversarially construct a set of cache lines, you might need a far larger amount of memory to store page tables for them. Whether you consider that an "error" or just a simplifying assumption is a matter of opinion I suppose

seoaeu

قبل 4 سنواتdiscuss

It only takes ~200KB to store page tables for 96MB of address space. So the page table entries might mostly stay in the L1 and L2 caches

seoaeu

قبل 4 سنواتdiscuss

> That's right, you run out of TLB-entries before you run out of L3 cache these days.

This is more reasonable than it sounds. A TLB miss can in many cases be faster than a L3 cache hit

seoaeu

قبل 4 سنواتdiscuss

People are defined by what they say though. And a quick google search reveals that RMS’s “emacs virgins” comment wasn’t just an out of character remark he made once in passing

seoaeu

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Honestly, it is kind of surprising we've gotten this far assuming that basically all open source maintainers aren't malicious

seoaeu

قبل 5 سنواتdiscuss

One mental model is that Linux distros are really just curated package repositories, with all the upsides and drawbacks that come with that. Especially regarding their dogmatic insistence that across the entire repository there's only a single (or at most several) versions of any given library

seoaeu

قبل 5 سنواتdiscuss

Of course you can approximate the price: For each plot of land you consider the value under the counterfactual where any buildings on it weren't there but all the neighborhood surroundings were unchanged. The sum across all the plots in the city is the total land price.

seoaeu

قبل 5 سنواتdiscuss

A couple billion dollars divided by the number of houses in LA... actually wouldn't add that much value to the housing prices. After all, the total assessed value of real estate in the county is about $1.7 trillion.

seoaeu

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The linked talk specifically complains about everyone building off of Linux, because doing so bakes in a whole bunch of assumptions that are decades old and might not be the best options for today's hardware...

seoaeu

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One problem with arguing that something is an unintended consequence is that you have to prove that they're not among the intended consequences for the creator. I'm really not convinced that the original GPL authors weren't aware that their license would somewhat reduced openness (relative to permissive licenses) in its pursuit of other goals.

seoaeu

قبل 5 سنواتdiscuss

Obviously HN commenters like us are going to think that. Honestly, I bet even YouTube commenters would say the same about their own community.

seoaeu

قبل 5 سنواتdiscuss

The puzzling thing was that spectre V2 mitigations were cited as the main culprit. They were responsible by themselves for a 15-20% slowdown, which is about an order of magnitude worse than in my experience. I wonder if the system had IBRS enabled instead of using retpolines at the mitigation strategy?

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