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Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bit x86 (bisected)

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From: Christoph Lameter <cl@...>
To: Dan Williams <dan.j.williams@...>
Cc: Mel Gorman <mel@...>, Linus Torvalds <torvalds@...>, Andy Whitcroft <apw@...>, <linux-mm@...>, <linux-kernel@...>, NeilBrown <neilb@...>, <babydr@...>, <lee.schermerhorn@...>, <a.beregalov@...>, <akpm@...>
Subject: Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bit x86 (bisected)
Date: Thursday, July 3, 2008 - 9:37 am

What a convoluted description. Simply put: We clobber the nr_zones field
because we write beyond the bounds of the node_zonelists[] array in
struct pglist_data.
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Messages in current thread:
[problem] raid performance loss with 2.6.26-rc8 on 32-bit x8..., Dan Williams, (Mon Jun 30, 9:57 pm)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Mel Gorman, (Tue Jul 1, 4:09 am)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Andy Whitcroft, (Tue Jul 1, 1:58 pm)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Mel Gorman, (Tue Jul 1, 3:07 pm)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Dan Williams, (Tue Jul 1, 6:28 pm)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Dan Williams, (Tue Jul 1, 4:29 pm)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Mel Gorman, (Wed Jul 2, 1:18 am)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Dan Williams, (Wed Jul 2, 9:49 pm)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Mel Gorman, (Thu Jul 3, 12:27 am)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Linus Torvalds, (Thu Jul 3, 12:43 am)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Mel Gorman, (Thu Jul 3, 1:00 am)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Dan Williams, (Thu Jul 3, 1:54 am)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Mel Gorman, (Thu Jul 3, 12:38 pm)
Re: [problem] raid performance loss with 2.6.26-rc8 on 32-bi..., Christoph Lameter, (Thu Jul 3, 9:37 am)
[PATCH] Do not clobber pgdat-&gt;nr_zones during memory init..., Mel Gorman, (Thu Jul 3, 12:36 pm)
Re: [PATCH] Do not clobber pgdat-&gt;nr_zones during memory ..., Linus Torvalds, (Thu Jul 3, 12:44 pm)
Re: [PATCH] Do not clobber pgdat-&gt;nr_zones during memory ..., Mel Gorman, (Thu Jul 3, 1:16 pm)
Re: [PATCH] Do not clobber pgdat-&gt;nr_zones during memory ..., Linus Torvalds, (Thu Jul 3, 12:46 pm)