On 2024-08-06 11:47, Dan Ritter wrote:
Daniel M Gessel wrote:
On 2024-08-06 00:31, Bill Bogstad wrote:
We would have a whole lot fewer moles to whack if we changed our tools.
In some cases a 5% performance hit is huge - offering up "our programmers
make mistakes" as a justification is a non-starter.
Remember that:
- virtual machines impose a penalty of 1% or more -- worse when
not optimally configured
- the mitigations for various speculative execution and memory
hammer attacks can impose 2-30% penalties depending on
specific programs
- changes between stable kernel versions can be +/- 15% in some
cases
All of those can already be cited as "our programmers make mistakes".
I honestly don't know how the first two address programmer mistakes; can
you explain?
On the commercial OSs I've worked on, a 5% performance drop would be a
block-ship issue, depending on where it was seen.
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