From: Sergei Shtylyov <sshtylyov@mvista•com>
To: Alex Shi <alex.shi@intel•com>
Cc: linux-mips@linux-mips•org, linux-ia64@vger•kernel.org,
linux-sh@vger•kernel.org, dhowells@redhat•com, paulus@samba•org,
hpa@zytor•com, sparclinux@vger•kernel.org, mingo@kernel•org,
sivanich@sgi•com, x86@kernel•org, greg.pearson@hp•com,
chris.mason@oracle•com, arjan.van.de.ven@intel•com,
mattst88@gmail•com, pjt@google•com, fenghua.yu@intel•com,
seto.hidetoshi@jp•fujitsu.com, a.p.zijlstra@chello•nl,
cmetcalf@tilera•com, ak@linux•intel.com,
ink@jurassic•park.msu.ru, anton@samba•org, tglx@linutronix•de,
kamezawa.hiroyu@jp•fujitsu.com, rth@twiddle•net,
tony.luck@intel•com, torvalds@linux-foundation•org,
linux-kernel@vger•kernel.org, ralf@linux-mips•org,
lethal@linux-sh•org, linux-alpha@vger•kernel.org,
bob.picco@oracle•com, akpm@linux-foundation•org,
linuxppc-dev@lists•ozlabs.org, davem@davemloft•net
Subject: Re: [RFC PATCH] sched/numa: do load balance between remote nodes
Date: Wed, 06 Jun 2012 14:53:08 +0400 [thread overview]
Message-ID: <4FCF3694.206@mvista.com> (raw)
In-Reply-To: <1338965571-9812-1-git-send-email-alex.shi@intel.com>
Hello.
On 06-06-2012 10:52, Alex Shi wrote:
> commit cb83b629b
Please also specify that commit's summary in parens.
> remove the NODE sched domain and check if the node
> distance in SLIT table is farther than REMOTE_DISTANCE, if so, it will
> lose the load balance chance at exec/fork/wake_affine points.
> But actually, even the node distance is farther than REMOTE_DISTANCE,
> Modern CPUs also has QPI like connections, that make memory access is
"Is" not needed here.
> not too slow between nodes. So above losing on NUMA machine make a
> huge performance regression on benchmark: hackbench, tbench, netperf
> and oltp etc.
> This patch will recover the scheduler behavior to old mode on all my
> Intel platforms: NHM EP/EX, WSM EP, SNB EP/EP4S, and so remove the
> perfromance regressions. (all of them just has 2 kinds distance, 10 21)
> Signed-off-by: Alex Shi<alex.shi@intel•com>
WBR, Sergei
prev parent reply other threads:[~2012-06-06 10:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-06 6:52 [RFC PATCH] sched/numa: do load balance between remote nodes Alex Shi
2012-06-06 9:01 ` Peter Zijlstra
2012-06-07 0:33 ` Alex Shi
2012-06-06 10:53 ` Sergei Shtylyov [this message]
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