From: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
To: Peter Zijlstra <peterz@infradead.org>
Cc: tglx@linutronix.de, x86@kernel.org, linux-kernel@vger.kernel.org,
kevin.b.stanton@intel.com
Subject: Re: [PATCH 0/3] x86: TSC_DEADLINE vs TSC_ADJUST and microcode revisions
Date: Wed, 31 May 2017 15:38:47 -0300 [thread overview]
Message-ID: <20170531183846.GB31565@khazad-dum.debian.net> (raw)
In-Reply-To: <20170531155201.218077283@infradead.org>
On Wed, 31 May 2017, Peter Zijlstra wrote:
> These patches rely on the latest microcode data files from Intel [*]
>
> Without this microcode loaded, we'll print a FW_BUG informing the user to
> update their microcode image and disable TSC_DEADLINE support.
>
> This in turn allows us to remove the TSC_ADJUST workarounds which were required
> due to errata.
Thanks!
On a related note, maybe it would be possible to do something about
SKL150/SKX150/KBL095 as well?
Working around that errata requires disabling hyperthreads on Skylake
when microcode < 0xb9 (confirmed to fix the issue by users suffering
from SKL150), and for Kabylake, disable hyperthreading when microcode <
0x5d (personal best guess based on microcode release date -- someone
@intel might want to confirm it).
--
Henrique Holschuh
prev parent reply other threads:[~2017-05-31 18:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-31 15:52 [PATCH 0/3] x86: TSC_DEADLINE vs TSC_ADJUST and microcode revisions Peter Zijlstra
2017-05-31 15:52 ` [PATCH 1/3] x86/apic: Change the lapic name in deadline mode Peter Zijlstra
2017-06-04 20:01 ` [tip:x86/timers] " tip-bot for Peter Zijlstra
2017-05-31 15:52 ` [PATCH 2/3] x86/apic: Add TSC_DEADLINE quirk due to errata Peter Zijlstra
2017-05-31 21:58 ` Henrique de Moraes Holschuh
2017-06-01 9:35 ` Peter Zijlstra
2017-06-01 9:58 ` Thomas Gleixner
2017-06-01 17:29 ` Henrique de Moraes Holschuh
2017-06-04 20:01 ` [tip:x86/timers] " tip-bot for Peter Zijlstra
2017-05-31 15:52 ` [PATCH 3/3] x86/tsc: Remove the TSC_ADJUST clamp Peter Zijlstra
2017-06-04 20:02 ` [tip:x86/timers] " tip-bot for Peter Zijlstra
2017-05-31 18:38 ` Henrique de Moraes Holschuh [this message]
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