When is disabling Intel spectre/meltdown kernel level mitigation a good option?
I am running ubuntu 64-bit 18.04 (upgraded from 16.04) on a HP 2170p laptop that houses an Intel® Core™ i5-3427U CPU (specs here: https://ark.intel.com/content/www/us/en/ark/products/64903/intel-core-i5-3427u-processor-3m-cache-up-to-2-80-ghz.html). I am also running this system with the most recent BIOS v.71 Rev.A issued Aug 22, 2018, and with Intel microcode version 3.20180807a.0ubuntu0.18.04.1.
Looking at these specs I see the i5-3427u is listed with a lithopgraphy of 22 nm. According to the Intel pages here (see impacted intel platform sections at the bottom of each respective page):
1) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-1-2-3.html
2) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-3a-4.html
3) https://www.intel.com/content/www/us/en/architecture-and-technology/l1tf.html
this 3rd-gen i5 is NOT impacted, while those versions with lithographies of 45 nm and 32 nm are.
As a result, I have added these boot options to grub: nospectre_v2 nopti nospec_store_bypass_disable; thereby disabling all mitigations for spectre v2 and v4, and meltdown (according to information here: https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown/MitigationControls)
As a result, my system is much snappier, and I would like to leave these Ubuntu kernel level mitigations disabled, since as far as i understand it, I don't actually need them.
I think I have done enough homework, but I am not confident in this topic, and ask for answers from the community. My main concern is if I have missed something and am making a mistake by disabling these spectre/meltdown mitigations? Or is one safe to do this if by all accounts it appears their intel chip is not affected?
18.04 kernel
asked Dec 21 '18 at 7:09
GWD72
113
add a comment |
I am running ubuntu 64-bit 18.04 (upgraded from 16.04) on a HP 2170p laptop that houses an Intel® Core™ i5-3427U CPU (specs here: https://ark.intel.com/content/www/us/en/ark/products/64903/intel-core-i5-3427u-processor-3m-cache-up-to-2-80-ghz.html). I am also running this system with the most recent BIOS v.71 Rev.A issued Aug 22, 2018, and with Intel microcode version 3.20180807a.0ubuntu0.18.04.1.
Looking at these specs I see the i5-3427u is listed with a lithopgraphy of 22 nm. According to the Intel pages here (see impacted intel platform sections at the bottom of each respective page):
1) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-1-2-3.html
2) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-3a-4.html
3) https://www.intel.com/content/www/us/en/architecture-and-technology/l1tf.html
this 3rd-gen i5 is NOT impacted, while those versions with lithographies of 45 nm and 32 nm are.
As a result, I have added these boot options to grub: nospectre_v2 nopti nospec_store_bypass_disable; thereby disabling all mitigations for spectre v2 and v4, and meltdown (according to information here: https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown/MitigationControls)
As a result, my system is much snappier, and I would like to leave these Ubuntu kernel level mitigations disabled, since as far as i understand it, I don't actually need them.
I think I have done enough homework, but I am not confident in this topic, and ask for answers from the community. My main concern is if I have missed something and am making a mistake by disabling these spectre/meltdown mitigations? Or is one safe to do this if by all accounts it appears their intel chip is not affected?
18.04 kernel
asked Dec 21 '18 at 7:09
GWD72
113
add a comment |
I am running ubuntu 64-bit 18.04 (upgraded from 16.04) on a HP 2170p laptop that houses an Intel® Core™ i5-3427U CPU (specs here: https://ark.intel.com/content/www/us/en/ark/products/64903/intel-core-i5-3427u-processor-3m-cache-up-to-2-80-ghz.html). I am also running this system with the most recent BIOS v.71 Rev.A issued Aug 22, 2018, and with Intel microcode version 3.20180807a.0ubuntu0.18.04.1.
Looking at these specs I see the i5-3427u is listed with a lithopgraphy of 22 nm. According to the Intel pages here (see impacted intel platform sections at the bottom of each respective page):
1) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-1-2-3.html
2) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-3a-4.html
3) https://www.intel.com/content/www/us/en/architecture-and-technology/l1tf.html
this 3rd-gen i5 is NOT impacted, while those versions with lithographies of 45 nm and 32 nm are.
As a result, I have added these boot options to grub: nospectre_v2 nopti nospec_store_bypass_disable; thereby disabling all mitigations for spectre v2 and v4, and meltdown (according to information here: https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown/MitigationControls)
As a result, my system is much snappier, and I would like to leave these Ubuntu kernel level mitigations disabled, since as far as i understand it, I don't actually need them.
I think I have done enough homework, but I am not confident in this topic, and ask for answers from the community. My main concern is if I have missed something and am making a mistake by disabling these spectre/meltdown mitigations? Or is one safe to do this if by all accounts it appears their intel chip is not affected?
18.04 kernel
asked Dec 21 '18 at 7:09
GWD72
113
I am running ubuntu 64-bit 18.04 (upgraded from 16.04) on a HP 2170p laptop that houses an Intel® Core™ i5-3427U CPU (specs here: https://ark.intel.com/content/www/us/en/ark/products/64903/intel-core-i5-3427u-processor-3m-cache-up-to-2-80-ghz.html). I am also running this system with the most recent BIOS v.71 Rev.A issued Aug 22, 2018, and with Intel microcode version 3.20180807a.0ubuntu0.18.04.1.
Looking at these specs I see the i5-3427u is listed with a lithopgraphy of 22 nm. According to the Intel pages here (see impacted intel platform sections at the bottom of each respective page):
1) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-1-2-3.html
2) https://www.intel.com/content/www/us/en/architecture-and-technology/side-channel-variants-3a-4.html
3) https://www.intel.com/content/www/us/en/architecture-and-technology/l1tf.html
this 3rd-gen i5 is NOT impacted, while those versions with lithographies of 45 nm and 32 nm are.
As a result, I have added these boot options to grub: nospectre_v2 nopti nospec_store_bypass_disable; thereby disabling all mitigations for spectre v2 and v4, and meltdown (according to information here: https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown/MitigationControls)
As a result, my system is much snappier, and I would like to leave these Ubuntu kernel level mitigations disabled, since as far as i understand it, I don't actually need them.
I think I have done enough homework, but I am not confident in this topic, and ask for answers from the community. My main concern is if I have missed something and am making a mistake by disabling these spectre/meltdown mitigations? Or is one safe to do this if by all accounts it appears their intel chip is not affected?
18.04 kernel
18.04 kernel
asked Dec 21 '18 at 7:09
GWD72
113
asked Dec 21 '18 at 7:09
GWD72
113
asked Dec 21 '18 at 7:09
GWD72
113
asked Dec 21 '18 at 7:09
GWD72
113
asked Dec 21 '18 at 7:09
GWD72
113
113
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1103514%2fwhen-is-disabling-intel-spectre-meltdown-kernel-level-mitigation-a-good-option%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Ask Ubuntu!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1103514%2fwhen-is-disabling-intel-spectre-meltdown-kernel-level-mitigation-a-good-option%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
