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Intel Kernel Memory Flaw - "Looking at a Ballpark Figure of 5-30% slow down"


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30 replies to this topic

#21
Malcador

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Following this on Reddit with the typical fanboys and inability to read and conclusion jumping has been fun.

I guess we are lucky it is hard to exploit Spectre
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#22
AwesomeOcelot

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Reddit and The Register, not the best places to go to get a reasonable perspective on breaking tech news.



#23
injurai

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I wonder how many millions of jump statements just got inserted into all my binaries...



#24
Jozape

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It needs to be pointed out that this isn't a "kernel" flaw: the kernel is software e.g. Linux. Intel only makes the CPU and its microcode. The flaw is in the CPU but its being mitigated -- at a substantial cost -- by Linux. Epic Games' Fortnite's servers experienced much more than a 30 or even 50 percent slowdown btw, so these slowdowns aren't just theoretical.

 

https://www.epicgame...tability-update


Edited by Jozape, 08 January 2018 - 07:51 AM.


#25
injurai

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Did this affect the performance on personal machines or just server architecture?



#26
Jozape

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Did this affect the performance on personal machines or just server architecture?

Technically, any machine using an Intel CPU that is not an Itanium is affected. Most of the time this is insubstantial for single-player games and web browsing. Multi-player games can be severely affected on the server side though. I read that some disk heavy activities on flash disks can be significantly slowed down, but I don't know about mechanical disks. If you don't run virtual machines, you don't run a server, and you don't do disk heavy activities, you are probably looking at a minimal performance drop for anything where performance is actually meaningful nowadays.



#27
Zoraptor

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There will need to be BIOS updates to fully implement protection as well, so the exact performance loss is still unclear at this point. But yeah, certainly shouldn't be much if anything for games since they're almost always limited by the graphics card power rather than CPU; and most basic productivity and home computing tasks are not taxing on modern CPUs either.


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#28
injurai

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It would make turns in Civ V longer. Just because often rigs are gpu limited doesn't mean cpu specific tasks won't take a hit. In fact most animation is done one the cpu.



#29
Zoraptor

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There aren't many turn based games, and even fewer where there is a significant AI 'turn' to take into account, hence "almost all" games being GPU limited by the ability to draw and fill polys and apply effects. It may also have an adverse effect on frame rates if you're playing at 720p low details with a 1080Ti, but that combination is also pretty rare and practically only used if you're trying to make a point or doing CPU testing.


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#30
Gorgon

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Yeah, so what about Photoshop, Zbrush, 3dsMax, Unreal Engline,  that sort of thing. A lot of people use those on their regular desktop.

 

Well, some anyway.



#31
Zoraptor

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They all depend on how much strain they put on the CPU- what you're using the program for, how demanding the program and its functions are, whether it's multithreaded or not and whether it uses the GPU and for what. If there's a different bottleneck than the CPU there shouldn't be much effect unless it hits one of the other areas Meltdown/ Spectre fixes effect like certain types of disk functions. From what I remember Photoshop is badly optimised and has no effective multithreading at all and little (only with a couple of functions, iirc) GPU based acceleration so I'd suspect it would be adversely effected especially for intensive processes; IIRC the others all have some degree of multithreading andor GPU acceleration built in so are likely to be effected less, dependent on what exactly you're doing with them.

 

It will also be dependent on what your hardware is, a well threaded program on an 8700k may be slightly slower than before but still faster than any other non enthusiast platform (though a very well threaded app on a r7 will likely be faster since SMT>>HT and the r7 has 2 extra cores). OTOH something a little bit older, less powerful and with fewer threads is likely to take a bigger hit since it's more likely to be struggling already.


Edited by Zoraptor, 26 January 2018 - 11:42 AM.





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