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Subject: Re: [UnifiedV4 00/16] The Unified slab allocator (V4)
From: "Alex,Shi" <alex.shi@intel.com>
To: Christoph Lameter <cl@linux.com>
Cc: "Wu, Fengguang" <fengguang.wu@intel.com>,
        Pekka Enberg <penberg@kernel.org>,
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        "Li, Shaohua" <shaohua.li@intel.com>
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Date: Tue, 19 Oct 2010 08:01:44 +0800
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On Tue, 2010-10-19 at 02:00 +0800, Christoph Lameter wrote:
> On Wed, 13 Oct 2010, Alex,Shi wrote:
> 
> > I got the code from
> > git://git.kernel.org/pub/scm/linux/kernel/git/christoph/slab.git unified
> > on branch "origin/unified" and do a patch base on 36-rc7 kernel. Then I
> > tested the patch on our 2P/4P core2 machines and 2P NHM, 2P WSM
> > machines. Most of benchmark have no clear improvement or regression. The
> > testing benchmarks is listed here.
> > http://kernel-perf.sourceforge.net/about_tests.php
> 
> Ah. Thanks. The tests needs to show a clear benefit for this to be a
> viable solution. They did earlier without all the NUMA queuing on SMP.
> 
> > BTW, I save several time kernel panic in fio testing:
> > ===================
> > > Pid: 776, comm: kswapd0 Not tainted 2.6.36-rc7-unified #1 X8DTN/X8DTN
> > > > RIP: 0010:[<ffffffff810cc21c>]  [<ffffffff810cc21c>] slab_alloc
> > > > +0x562/0x6f2
> 
> Cannot see the error message? I guess this is the result of a BUG_ON()?
> I'll try to run that fio test first.
> 
Can not see error messages since the machine hang when any ops appear.
And the panic ops just pop up randomly, don't know how to reproduce it
now.