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"Intel processor design flaw forces Linux, Windows redesign"



 
 
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  #11  
Old January 9th 18, 10:02 AM posted to alt.comp.hardware,alt.os.linux
Richard Kettlewell[_2_]
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Posts: 5
Default "Intel processor design flaw forces Linux, Windows redesign"

William Unruh writes:
I could be wrong but it seems like the OS fix makes things much worse
than they would be if the speedup in the cpu were not there. Ie,
having to reload the kernel each time you need to use a kernel routine
is far slower than if you simply got rid of the speculative
computation.


The kernel is not being reloaded.

Abandoning speculative execution would have a colossal performance
impact. You’d pay for it in every iteration of every loop the processor
executed, not merely every syscall. Admittedly without having measured
it, the idea that it’d be faster to abandon speculative execution than
to enable KPTI is pretty implausible.

--
https://www.greenend.org.uk/rjk/
  #12  
Old January 9th 18, 04:09 PM posted to alt.comp.hardware,alt.os.linux
Caver1
external usenet poster
 
Posts: 3
Default "Intel processor design flaw forces Linux, Windows redesign"

On 01/09/2018 04:02 AM, Richard Kettlewell wrote:
William Unruh writes:
I could be wrong but it seems like the OS fix makes things much worse
than they would be if the speedup in the cpu were not there. Ie,
having to reload the kernel each time you need to use a kernel routine
is far slower than if you simply got rid of the speculative
computation.


The kernel is not being reloaded.

Abandoning speculative execution would have a colossal performance
impact. You’d pay for it in every iteration of every loop the processor
executed, not merely every syscall. Admittedly without having measured
it, the idea that it’d be faster to abandon speculative execution than
to enable KPTI is pretty implausible.


Raspberry Pi doesn't use speculative execution and it doesn't have the
"colossal" performance impact.

--
Caver1
  #13  
Old January 9th 18, 04:50 PM posted to alt.comp.hardware,alt.os.linux
Richard Kettlewell[_2_]
external usenet poster
 
Posts: 5
Default "Intel processor design flaw forces Linux, Windows redesign"

Caver1 writes:
On 01/09/2018 04:02 AM, Richard Kettlewell wrote:
William Unruh writes:
I could be wrong but it seems like the OS fix makes things much worse
than they would be if the speedup in the cpu were not there. Ie,
having to reload the kernel each time you need to use a kernel routine
is far slower than if you simply got rid of the speculative
computation.


The kernel is not being reloaded.

Abandoning speculative execution would have a colossal performance
impact. You’d pay for it in every iteration of every loop the processor
executed, not merely every syscall. Admittedly without having measured
it, the idea that it’d be faster to abandon speculative execution than
to enable KPTI is pretty implausible.


Raspberry Pi doesn't use speculative execution and it doesn't have the
"colossal" performance impact.


I have one, it’s hopelessly slow compared to x86 CPUs from a decade ago,
never mind anything vaguely modern.

--
https://www.greenend.org.uk/rjk/
 




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