meltdown / spectre patches performance impact

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meltdown / spectre patches performance impact

Marco Padovan
Hi,

what are you seeing as performance impacts after updating the kernel and microcode to patch against those two hardware vulnerabilities?

On our test before/after we are not seeing negligible difference (if none at all), is this common to everybody and therefore csgo code didn't benefit much from the speculative predictions?

Cheers,
Marco

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Re: meltdown / spectre patches performance impact

Brendan H

Srcds performance is not bounded by syscalls.  There aren't very many syscalls in srcds' hotpath (except for maybe networking), and since KPTI is only activated during a sysenter and sysexit, I wouldn't expect Meltdown mitigations, particularly KPTI, to have a noticeable impact on srcds performance.


On 1/7/2018 03:31, Marco Padovan wrote:
Hi,

what are you seeing as performance impacts after updating the kernel and microcode to patch against those two hardware vulnerabilities?

On our test before/after we are not seeing negligible difference (if none at all), is this common to everybody and therefore csgo code didn't benefit much from the speculative predictions?

Cheers,
Marco


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