linux-kernel - Re: Hack bench regression with CONFIG_SLUB_CPU

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Message-ID: <1374750359.23313.17.camel@edumazet-glaptop>
Date:	Thu, 25 Jul 2013 04:05:59 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Gao feng <gaofeng@...fujitsu.com>
Subject: Re: Hack bench regression with CONFIG_SLUB_CPU_PARTIAL disabled
 (info only)

On Thu, 2013-07-25 at 13:30 +0530, Raghavendra K T wrote:
> Hi,
> 
> While testing hackbench with 3.11-rc1 I observed hackbench testcase
> took too long to complete (32 vcpu kvm guest on 32 core HT off machine).
> 
> hackbench 1x degraded by 3 time (40sec vs 112sec)
> hackbench 2x degraded by around 20time (90sec vs 1800 sec)
> 
> When I bisected, I found that I had CONFIG_SLUB_CPU_PARTIAL
> accidentally disabled.
> I understand that  CONFIG_SLUB_CPU_PARTIAL=y by default and the config
> option is to provide determinism for RT kernels and thus it is not a
> problem.
> But thought of sharing this here so that if somebody runs into same 
> issue accidently, it would save their time.

Incidentally, what difference do you currently get with SLUB and SLAB ?



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