Hi, While a performance hit will likely be there, it is hard to say how big it will be. It really depends on the workload. Ciao, Marcus On Thu, Jan 04, 2018 at 08:12:19PM -0200, Jones de Andrade wrote:
Am I wrong, or does it mean that a performance hit is unavoidable?
Em 4 de jan de 2018 6:25 PM, "Marcus Meissner" <meissner@suse.de> escreveu:
On Thu, Jan 04, 2018 at 08:12:53PM +0100, Daniel Bauer wrote:
Am 04.01.2018 um 19:52 schrieb James Knott:
On 01/04/2018 01:50 PM, James Knott wrote:
You could suffer worse ... TYPICAL slowdown is supposed to be about >5%. Worst case is nearer 30% I believe ... I see there's a couple of software updates available now, kernel-firmware and microcode updates for AMD CPUs. Would these have anything to do with this problem.
It appears they do. Here's what the patch description says:
"openSUSE-2018-1 - Security update for kernel-firmware
This update for kernel-firmware fixes the following issues: - Add microcode_amd_fam17h.bin (bsc#1068032 CVE-2017-5715) This new firmware disables branch prediction on AMD family 17h processor to mitigate a attack on the branch predictor that could lead to information disclosure from e.g. kernel memory (bsc#1068032
CVE-2017-5715)."
So with intel this doesn't help and must not be installed?
For Intel the update is "ucode-intel".
it is just part of the fix, the kernel update is needed to implement it.
Ciao, Marcus
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