netdev - Re: [PATCH 0/6] fs: Scalability of sockets/pipes allocation/deallocation on SMP

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Date:	Fri, 28 Nov 2008 19:47:56 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, Mike Galbraith <efault@....de>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 0/6] fs: Scalability of sockets/pipes
 allocation/deallocation on SMP

On Fri, 2008-11-28 at 19:03 +0100, Ingo Molnar wrote:
> * Eric Dumazet <dada1@...mosbay.com> wrote:
> 
> > Hi all
> >
> > Short summary : Nice speedups for allocation/deallocation of sockets/pipes
> > (From 27.5 seconds to 1.6 second)
> 
> Wow, that's incredibly impressive! :-)

Yeah, we got a similar speedup on -rt by pushing those super-block files
list into per-cpu lists and doing crazy locking on them.

Of course avoiding them all together, like done here is a nicer option
but is sadly not a possibility for regular files (until hch gets around
to removing the need for the list).



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