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| From: | Adam Carter <adamcarter3@×××××.com> | ||
|---|---|---|---|
| To: | gentoo-user@l.g.o | ||
| Subject: | Re: [gentoo-user] Expect a ~15% average slowdown if you use an Intel processor | ||
| Date: | Thu, 04 Jan 2018 03:25:12 | ||
| Message-Id: | CAC=wYCH+cTYoMrRtQZLeEvWuEoRb_uZcLs=m5twwUdF322GV_Q@mail.gmail.com | ||
| In Reply to: | [gentoo-user] Expect a ~15% average slowdown if you use an Intel processor by P Levine |
||
| 1 | On Thu, Jan 4, 2018 at 2:15 PM, P Levine <plevine457@×××××.com> wrote: |
| 2 | |
| 3 | > I'm not sure if it's been mentioned here before but there apparently is a |
| 4 | > bug affecting all Intel CPUs manufactured in the last 10 years or so, in |
| 5 | > which protected kernel memory is leaked to userspace. It can't be patched |
| 6 | > in microcode and will lead to some serious overhead to patch in the OS. |
| 7 | > See, Huge Intel CPU Bug Allegedly Causes Kernel Memory Vulnerability With |
| 8 | > Up To 30% Performance Hit In Windows And Linux |
| 9 | > <https://hothardware.com/news/intel-cpu-bug-kernel-memory-isolation-linux-windows-macos> |
| 10 | > and Meltdown and Spectre <https://meltdownattack.com/>. |
| 11 | > |
| 12 | > Reported at Bug 643360 <https://bugs.gentoo.org/643360>. |
| 13 | > |
| 14 | |
| 15 | Its been mentioned in another thread, but I guess its a bit off topic there. |
| 16 | |
| 17 | Project Zero (Google) found it; |
| 18 | https://googleprojectzero.blogspot.com.au/2018/01/reading-privileged-memory-with-side.html |
| 19 | |
| 20 | Phoronix has done some benchmarks on the impact of the kernel based |
| 21 | workaround ([Kernel] Page Table Isolation (PSI) nee Kaiser) |
| 22 | https://www.phoronix.com/scan.php?page=article&item=linux-more-x86pti&num=1 |
| Subject | Author |
|---|---|
| Re: [gentoo-user] Expect a ~15% average slowdown if you use an Intel processor | Adam Carter <adamcarter3@×××××.com> |