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Message-ID: <20100625145622.GB13421@basil.fritz.box> Date: Fri, 25 Jun 2010 16:56:22 +0200 From: Andi Kleen <andi@...stfloor.org> To: Nathan Fontenot <nfont@...tin.ibm.com> Cc: Andi Kleen <andi@...stfloor.org>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] memory hotplug disable boot option On Fri, Jun 25, 2010 at 09:51:37AM -0500, Nathan Fontenot wrote: > > > >>> Proposed patch to disable memory hotplug via a boot option, > >>> mem_hotplug=[on|off]. The patch only disables memory hotplug in that it > >>> prevents the creation of the memory sysfs directories for memory sections. > >>> > >>> This patch is meant to help alleviate very long boot times on systems with > >>> large memory (1+ TB) and many memory sections (10's of thousands). > >> > >> Why making simple /sys file is so slowly? Couldn't we fix such performance > >> problem? > > The issue is the large number of sysfs memory directories that get created. > On a system with 1 TB of memory I am seeing ~63,00 directories. The long Maybe you could simply make the memory blocks larger on such large systems? I agree 6k blocks are probably not very useful, but maybe 10 or 100 are? -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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