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From: Laurent Laborde <kerdezixe@gmail.com>
To: Laurent Wandrebeck <l.wandrebeck@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: "iowait" bug?
Date: Sun, 22 Mar 2009 16:29:35 +0100
Message-ID: <8a1bfe660903220829j4605306fj2382e6c169abdcbe@mail.gmail.com> (raw)
In-Reply-To: <fc593b510903220049u4f785150jf7651c53fe3af637@mail.gmail.com>
References: <af0420cd0903200945m7f70d057p12942b50c8266bcb@mail.gmail.com>
	<af0420cd0903202117i66109820s31b440bc7648c358@mail.gmail.com>
	<fc593b510903220049u4f785150jf7651c53fe3af637@mail.gmail.com>

On Sun, Mar 22, 2009 at 8:49 AM, Laurent Wandrebeck
<l.wandrebeck@gmail.com> wrote:
> 2009/3/21 M. Edward (Ed) Borasky <zznmeb@gmail.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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