From: Nikola Ciprich <nikola.ciprich@linuxbox.cz>
To: linux-kernel mlist <linux-kernel@vger.kernel.org>
Cc: stable@kernel.org, netdev@vger.kernel.org
Subject: Re: 3.0.12 - unregister_pernet_gen_subsys hogging whole system
Date: Thu, 22 Dec 2011 22:52:46 +0100 [thread overview]
Message-ID: <20111222215246.GA2694@nik-comp.lan> (raw)
In-Reply-To: <20111222151908.GA11020@pcnci.linuxbox.cz>
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> after updating one of our servers to 3.0.12 kernel, it became painfully slow (actually
> it's almost unusable).
>
> trying perf top, I see following:
>
> 27465.00 - 59.8% : unregister_pernet_gen_subsys
> 3144.00 - 6.8% : __start_notes
> 1211.00 - 2.6% : swiotlb_sync_sg
> 1155.00 - 2.5% : swiotlb_unmap_sg_attrs
> 621.00 - 1.4% : pci_pm_init
> 565.00 - 1.2% : swiotlb_map_sg_attrs
> 503.00 - 1.1% : cgroup_attach_task
crap, I was using too old perf binary - that might be reason why I wasn't able
to find any evidence of unregister_pernet_gen_subsys for 3.x kernels :)
I switched to 3.0.13 now (and actual perf) and it seems better..
Should the problem reappear, I'll report it..
sorry for the fuzz..
n.
>
> I wasn't too successfull trying to find something related, so I'd like to ask,
> which subsystem might be calling unregister_pernet_gen_subsys and why?
> I guess this is certaingly a bug... Could somebody please have a look at this?
> I'll provide all debugging information I can if needed..
>
> thanks a lot in advance
>
> with best regards
>
> nik
>
> --
> -------------------------------------
> Ing. Nikola CIPRICH
> LinuxBox.cz, s.r.o.
> 28. rijna 168, 709 01 Ostrava
>
> tel.: +420 596 603 142
> fax: +420 596 621 273
> mobil: +420 777 093 799
> www.linuxbox.cz
>
> mobil servis: +420 737 238 656
> email servis: servis@linuxbox.cz
> -------------------------------------
--
-------------------------------------
Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
28. rijna 168, 709 01 Ostrava
tel.: +420 596 603 142
fax: +420 596 621 273
mobil: +420 777 093 799
www.linuxbox.cz
mobil servis: +420 737 238 656
email servis: servis@linuxbox.cz
-------------------------------------
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prev parent reply other threads:[~2011-12-22 21:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 15:19 3.0.12 - unregister_pernet_gen_subsys hogging whole system Nikola Ciprich
2011-12-22 21:52 ` Nikola Ciprich [this message]
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