Originally posted by Steffo
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Benchmarking The Performance Impact To AMD Inception Mitigations
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Speaking of performance impacts from security mitigations, was there any benchmarks on how the fix for Zenbleed affects performance, or is it not expected to be as much of an issue as Inception or Downfall? I've lost track of all this stuff by now, what a mess.
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Originally posted by 2A4U View PostI tried kernel parameter 'mitigations=off' a few weeks ago and it disabled kernel modesetting. Is there something that needs to be enabled in the kernel for modesetting if mitigations are off?
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Originally posted by mv.gavrilov View PostPlease retest with enable KASAN in kernel.
I noticed that KASAN + safe RATE decrease performance of 7950X in two times in games and kernel build.
Fedora Rawhide enable KASAN by default in debug builds.
https://lore.kernel.org/lkml/2023081...crate.local/T/
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Originally posted by MrCooper View Post
Debug build kernels are for investigating kernel bugs, not for production.
For example:
https://lore.kernel.org/lkml/CABXGCs...kckQCx8_wCknec [email protected]/
https://lore.kernel.org/lkml/CABXGCs...pxtmA=NAzPHYVM [email protected]/
Linux Wireless: mt76 patchset cause KASAN: use-after-free in tasklet_action_common.isra.0+0x6a4 when computer shutdown
Linux Kernel: [6.4-rc7][regression] slab-out-of-bounds in amdgpu_sw_ring_ib_mark_offset+0x2c1/0x2e0 [amdgpu]
AMD GFX: KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] - RIP: 0010:amdgpu_bo_get_memory+0x80/0x360 [amdgpu]
https://lore.kernel.org/lkml/CABXGCs...zrr9sMxZdzLiTJ [email protected]/T/#reeb30a87db9e6bd25e3773b160d25ac54d4e1aaa
All these problems would be not visible if mainteners of Fedora Rawhide did not decide to enable KASAN in debug builds.
I ask you to consider Fedora debug kernels as full-fledged kernels with debugging benefits.Last edited by mv.gavrilov; 16 August 2023, 07:38 PM.
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The more complex,the buggier . Poor Q/A, rush to release to beat competition in PR ,and also those CodeHeads who spend all day long sniffing ‘vulnerabilites’ …damn . I miss the old days .
This fetish ,with ‘security’ ,in regular desktop space OMG . Safety,security ! Privacy ! 3 letter agencies ! Danger ! Dont care about servers,most of us are desktop users.
I dont do Banking / financial on my desktop PC anyway,for that my iPhone is probably a LOT safer.
For anything else,its just stroking eachother among the security people.
Just dont slow me this Linux with ‘mitigations’ to the point of a jerky potato ! Not everyone can afford a bazillion cores machines .Last edited by Crocodilus; 16 August 2023, 06:49 PM.
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