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Re:Intel Security Issue Update: Addressing Reboot Issues by paulmd on Friday January 12, 2018 @12:53PM (#16134771)
Meltdown is a specific type of Spectre exploit.

While it's more easily exploited, it's also patchable with minimal performance impact, unlike Spectre in general.

Re:Intel Security Issue Update: Addressing Reboot Issues by pritambaral on Friday January 12, 2018 @05:37PM (#16136957)
No, it's not. Please read the website of the attacks created by those who discovered and named them: https://meltdownattack.com and https://spectreattack.com
Re:Intel Security Issue Update: Addressing Reboot Issues by EgoIncarnate on Friday January 12, 2018 @05:32PM (#16136932)
Potentially minimal is probably more accurate. It's workload dependent. In some cases, such as frequent interrupts or system calls on older CPUs without the PCID and INVPCIB features to mitigate the cost, it can be be very expensive.