From: Alexander Graf <agraf@suse.de>
To: Michael Neuling <mikey@neuling.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org,
kvm-ppc@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH v2 0/6] Implement split core for POWER8
Date: Fri, 23 May 2014 09:53:17 +0000 [thread overview]
Message-ID: <537F1A8D.9000704@suse.de> (raw)
In-Reply-To: <1400832930-17050-1-git-send-email-mikey@neuling.org>
On 23.05.14 10:15, Michael Neuling wrote:
> This patch series implements split core mode on POWER8. This enables up to 4
> subcores per core which can each independently run guests (per guest SPRs like
> SDR1, LPIDR etc are replicated per subcore). Lots more documentation on this
> feature in the code and commit messages.
>
> Most of this code is in the powernv platform but there's a couple of KVM
> specific patches too.
>
> Patch series authored by mpe and me with a few bug fixes from others.
>
> v2:
> There are some minor updates based on comments and I've added the Acks by
> Paulus and Alex for the KVM code.
I don't see changelogs inside the individual patches. Please make sure
to always mention what changed from one version to the next in a
particular patch, so that I have the chance to check whether that change
was good :).
Also, is there any performance penalty associated with split core mode?
If not, could we just always default to split-by-4 on POWER8 bare metal?
Alex
WARNING: multiple messages have this Message-ID (diff)
From: Alexander Graf <agraf@suse.de>
To: Michael Neuling <mikey@neuling.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org, Paul Mackerras <paulus@samba.org>,
kvm-ppc@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v2 0/6] Implement split core for POWER8
Date: Fri, 23 May 2014 11:53:17 +0200 [thread overview]
Message-ID: <537F1A8D.9000704@suse.de> (raw)
In-Reply-To: <1400832930-17050-1-git-send-email-mikey@neuling.org>
On 23.05.14 10:15, Michael Neuling wrote:
> This patch series implements split core mode on POWER8. This enables up to 4
> subcores per core which can each independently run guests (per guest SPRs like
> SDR1, LPIDR etc are replicated per subcore). Lots more documentation on this
> feature in the code and commit messages.
>
> Most of this code is in the powernv platform but there's a couple of KVM
> specific patches too.
>
> Patch series authored by mpe and me with a few bug fixes from others.
>
> v2:
> There are some minor updates based on comments and I've added the Acks by
> Paulus and Alex for the KVM code.
I don't see changelogs inside the individual patches. Please make sure
to always mention what changed from one version to the next in a
particular patch, so that I have the chance to check whether that change
was good :).
Also, is there any performance penalty associated with split core mode?
If not, could we just always default to split-by-4 on POWER8 bare metal?
Alex
WARNING: multiple messages have this Message-ID (diff)
From: Alexander Graf <agraf@suse.de>
To: Michael Neuling <mikey@neuling.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org,
kvm-ppc@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH v2 0/6] Implement split core for POWER8
Date: Fri, 23 May 2014 11:53:17 +0200 [thread overview]
Message-ID: <537F1A8D.9000704@suse.de> (raw)
In-Reply-To: <1400832930-17050-1-git-send-email-mikey@neuling.org>
On 23.05.14 10:15, Michael Neuling wrote:
> This patch series implements split core mode on POWER8. This enables up to 4
> subcores per core which can each independently run guests (per guest SPRs like
> SDR1, LPIDR etc are replicated per subcore). Lots more documentation on this
> feature in the code and commit messages.
>
> Most of this code is in the powernv platform but there's a couple of KVM
> specific patches too.
>
> Patch series authored by mpe and me with a few bug fixes from others.
>
> v2:
> There are some minor updates based on comments and I've added the Acks by
> Paulus and Alex for the KVM code.
I don't see changelogs inside the individual patches. Please make sure
to always mention what changed from one version to the next in a
particular patch, so that I have the chance to check whether that change
was good :).
Also, is there any performance penalty associated with split core mode?
If not, could we just always default to split-by-4 on POWER8 bare metal?
Alex
next prev parent reply other threads:[~2014-05-23 9:53 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-23 8:15 [PATCH v2 0/6] Implement split core for POWER8 Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` [PATCH v2 1/6] KVM: PPC: Book3S HV: Rework the secondary inhibit code Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` [PATCH v2 2/6] powerpc/powernv: Make it possible to skip the IRQHAPPENED check in power7_nap() Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` [PATCH v2 3/6] powerpc: Add threads_per_subcore Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` [PATCH v2 4/6] powerpc: Check cpu_thread_in_subcore() in __cpu_up() Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` [PATCH v2 5/6] KVM: PPC: Book3S HV: Use threads_per_subcore in KVM Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` [PATCH v2 6/6] powerpc/powernv: Add support for POWER8 split core on powernv Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 8:15 ` Michael Neuling
2014-05-23 9:53 ` Alexander Graf [this message]
2014-05-23 9:53 ` [PATCH v2 0/6] Implement split core for POWER8 Alexander Graf
2014-05-23 9:53 ` Alexander Graf
2014-05-23 10:00 ` Michael Neuling
2014-05-23 10:00 ` Michael Neuling
2014-05-23 10:00 ` Michael Neuling
2014-05-23 10:05 ` Alexander Graf
2014-05-23 10:05 ` Alexander Graf
2014-05-23 10:05 ` Alexander Graf
2014-05-23 10:11 ` Michael Neuling
2014-05-23 10:11 ` Michael Neuling
2014-05-23 10:11 ` Michael Neuling
2014-05-23 10:27 ` Alexander Graf
2014-05-23 10:27 ` Alexander Graf
2014-05-23 10:27 ` Alexander Graf
2014-05-23 10:50 ` Michael Neuling
2014-05-23 10:50 ` Michael Neuling
2014-05-23 10:50 ` Michael Neuling
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