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Date: Fri, 20 Sep 2002 15:07:34 -0700
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: William Lee Irwin III <wli@holomorphy.com>,
       "Bond, Andrew" <Andrew.Bond@hp.com>
cc: Dave Hansen <haveblue@us.ibm.com>, linux-kernel@vger.kernel.org
Subject: Re: TPC-C benchmark used standard RH kernel
Message-ID: <81250000.1032559653@flay>
In-Reply-To: <20020920205653.GM3530@holomorphy.com>
References: <45B36A38D959B44CB032DA427A6E106402D09E43@cceexc18.americas.cpqcorp.net> <20020920205653.GM3530@holomorphy.com>
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>> This isn't as recent as I would like, but it will give you an idea.
>> Top 75 from readprofile.  This run was not using bigpages though.
>> Andy
> 
>> 00000000 total                                      7872   0.0066
>> c0105400 default_idle                               1367  21.3594
>> c012ea20 find_vma_prev                               462   2.2212
>> c0142840 create_bounce                               378   1.1250
>> c0142540 bounce_end_io_read                          332   0.9881
>> c0197740 __make_request                              256   0.1290
>> c012af20 zap_page_range                              231   0.1739
>> c012e9a0 find_vma                                    214   1.6719
>> c012e780 avl_rebalance                               160   0.4762
> 
> Looks like you're doing a lot of mmapping or faulting requiring VMA
> lookups, or the number of VMA's associated with a task makes the
> various VMA manipulations extremely expensive.
> 
> Can you dump /proc/pid/maps on some of these processes?

Isn't that the magic Oracle 32Kb mmap hack at work here, in order
to get a >2Gb SGA?

M.

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