From: Johannes Hirte <johannes.hirte@datenkhaos.de>
To: Pavel Machek <pavel@ucw.cz>
Cc: "Christian Krüger" <C.Krueger.B@web.de>, linux-kernel@vger.kernel.org
Subject: Re: Suggestion: „spectre_v2=off“ and „nopti“ per default in "Intel Atom N270" case?
Date: Wed, 23 May 2018 19:07:07 +0200 [thread overview]
Message-ID: <20180523170706.GA21118@probook> (raw)
In-Reply-To: <20180523105302.GE15312@amd>
On 2018 Mai 23, Pavel Machek wrote:
> On Sat 2018-05-19 21:53:02, Christian Krüger wrote:
> > Hi,
> >
> > Since the old "in-order-execution" Intel CPUs like the Intel Atom N270
> > (known for being installed in many Netbooks and Nettops) are not sensitive
> > for "Meltdown" & "Spectre" , wouldn't it be a good idea to exclude these
> > anyway "weak" CPUs from the costly patches by default?
> >
> > Browsing the web, I can "feel the difference" if the matching kernel options
> > are applied on such a device.
>
> Can you also measure the difference? Placebo effect is hard to avoid.
>
> But yes, we do not need to do workarounds on non-buggy machines...
>
> Pavel
On my Atom N270 there doesn't seem to be any workaround active with
kernel 4.14.42:
localhost ~ # cat /sys/devices/system/cpu/vulnerabilities/*
Not affected
Not affected
Not affected
Christian, did you verified the mitigations are active on your system?
What kernels are affected?
--
Regards,
Johannes
next prev parent reply other threads:[~2018-05-23 17:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-19 19:53 Suggestion: „spectre_v2=off“ and „nopti“ per default in "Intel Atom N270" case? Christian Krüger
2018-05-23 10:53 ` Pavel Machek
2018-05-23 17:07 ` Johannes Hirte [this message]
2018-05-23 18:40 ` Christian Krüger
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