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Re: "iowait" bug?

From: Laurent Laborde <kerdezixe(at)gmail(dot)com>
To: Laurent Wandrebeck <l(dot)wandrebeck(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: "iowait" bug?
Date: 2009-03-22 15:29:35
Message-ID: 8a1bfe660903220829j4605306fj2382e6c169abdcbe@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Sun, Mar 22, 2009 at 8:49 AM, Laurent Wandrebeck
<l(dot)wandrebeck(at)gmail(dot)com> wrote:
> 2009/3/21 M. Edward (Ed) Borasky <zznmeb(at)gmail(dot)com>:
>> I just discovered this on a LinkedIn user group:
>>
>> http://bugzilla.kernel.org/show_bug.cgi?id=12309
>>
>> Is anyone here seeing evidence of this in PostgreSQL??
> I've been hit by an I/O wait problem, as described here:
> https://bugzilla.redhat.com/show_bug.cgi?id=444759
> I've told it to that other bug, but no one seems to have followed that path.

We applied this mwi patch on 3 pgsql servers, and seen great
performance improvement.
Using 3ware, 8 SAS HDD, Octocore (2x4) Xeon and 32GB RAM, on a custom
2.6.18 kernel.

-- 
Laurent Laborde
http://www.over-blog.com/

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