From: Peter Zijlstra <peterz@infradead.org>
To: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
virtualization@lists.linux-foundation.org,
benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
mingo@redhat.com, paulmck@linux.vnet.ibm.com, jeremy@goop.org,
chrisw@sous-sol.org, akataria@vmware.com, rusty@rustcorp.com.au
Subject: Re: [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention
Date: Thu, 26 May 2016 18:54:23 +0200 [thread overview]
Message-ID: <20160526165423.GN3206@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1464164289-6124-1-git-send-email-xinhui.pan@linux.vnet.ibm.com>
On Wed, May 25, 2016 at 04:18:03PM +0800, Pan Xinhui wrote:
> I do several tests on pseries IBM,8408-E8E with 32cpus, 64GB memory.
> benchmark test results are below.
> _____test________________spinlcok______________pv-qspinlcok_____
> | compiling takes| 22m | 22m |
How can a kernel build take 22 minutes with 32 CPUs? That's far too
long. My 40 CPU IVB-EP takes all of 50 seconds to build an
x86_64-defconfig from scratch.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Cc: jeremy@goop.org, mpe@ellerman.id.au,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, chrisw@sous-sol.org,
mingo@redhat.com, paulus@samba.org, benh@kernel.crashing.org,
akataria@vmware.com, paulmck@linux.vnet.ibm.com,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention
Date: Thu, 26 May 2016 18:54:23 +0200 [thread overview]
Message-ID: <20160526165423.GN3206@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1464164289-6124-1-git-send-email-xinhui.pan@linux.vnet.ibm.com>
On Wed, May 25, 2016 at 04:18:03PM +0800, Pan Xinhui wrote:
> I do several tests on pseries IBM,8408-E8E with 32cpus, 64GB memory.
> benchmark test results are below.
> _____test________________spinlcok______________pv-qspinlcok_____
> | compiling takes| 22m | 22m |
How can a kernel build take 22 minutes with 32 CPUs? That's far too
long. My 40 CPU IVB-EP takes all of 50 seconds to build an
x86_64-defconfig from scratch.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
virtualization@lists.linux-foundation.org,
benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
mingo@redhat.com, paulmck@linux.vnet.ibm.com, jeremy@goop.org,
chrisw@sous-sol.org, akataria@vmware.com, rusty@rustcorp.com.au
Subject: Re: [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention
Date: Thu, 26 May 2016 18:54:23 +0200 [thread overview]
Message-ID: <20160526165423.GN3206@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1464164289-6124-1-git-send-email-xinhui.pan@linux.vnet.ibm.com>
On Wed, May 25, 2016 at 04:18:03PM +0800, Pan Xinhui wrote:
> I do several tests on pseries IBM,8408-E8E with 32cpus, 64GB memory.
> benchmark test results are below.
> _____test________________spinlcok______________pv-qspinlcok_____
> | compiling takes| 22m | 22m |
How can a kernel build take 22 minutes with 32 CPUs? That's far too
long. My 40 CPU IVB-EP takes all of 50 seconds to build an
x86_64-defconfig from scratch.
next prev parent reply other threads:[~2016-05-26 16:54 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-25 8:18 [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-25 8:18 ` [PATCH v3 1/6] qspinlock: powerpc support qspinlock Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-25 8:18 ` [PATCH v3 2/6] powerpc: pseries/Kconfig: Add qspinlock build config Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-25 8:18 ` [PATCH v3 3/6] powerpc: lib/locks.c: Add cpu yield/wake helper function Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-25 8:18 ` [PATCH v3 4/6] pv-qspinlock: powerpc support pv-qspinlock Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-25 8:18 ` [PATCH v3 5/6] pv-qspinlock: use cmpxchg_release in __pv_queued_spin_unlock Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-26 16:47 ` Peter Zijlstra
2016-05-26 16:47 ` Peter Zijlstra
2016-05-26 16:57 ` Peter Zijlstra
2016-05-26 16:57 ` Peter Zijlstra
2016-05-27 10:34 ` xinhui
2016-05-27 10:34 ` xinhui
2016-05-27 10:34 ` xinhui
2016-05-25 8:18 ` [PATCH v3 6/6] powerpc: pseries: Add pv-qspinlock build config/make Pan Xinhui
2016-05-25 8:18 ` Pan Xinhui
2016-05-26 16:50 ` [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention Peter Zijlstra
2016-05-26 16:50 ` Peter Zijlstra
2016-05-26 16:50 ` Peter Zijlstra
2016-05-27 10:52 ` xinhui
2016-05-27 10:52 ` xinhui
2016-05-27 10:52 ` xinhui
2016-05-26 16:54 ` Peter Zijlstra [this message]
2016-05-26 16:54 ` Peter Zijlstra
2016-05-26 16:54 ` Peter Zijlstra
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