From: Eric Dumazet <eric.dumazet@gmail.com>
To: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Eric Dumazet <edumazet@google.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Gao feng <gaofeng@cn.fujitsu.com>
Subject: Re: Hack bench regression with CONFIG_SLUB_CPU_PARTIAL disabled (info only)
Date: Thu, 25 Jul 2013 04:05:59 -0700 [thread overview]
Message-ID: <1374750359.23313.17.camel@edumazet-glaptop> (raw)
In-Reply-To: <51F0DB11.2080508@linux.vnet.ibm.com>
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 ?
next prev parent reply other threads:[~2013-07-25 11:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-25 8:00 Raghavendra K T
2013-07-25 11:05 ` Eric Dumazet [this message]
2013-07-25 13:20 ` Raghavendra K T
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