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Re: Bad performance with XFS + 2.6.38 / 2.6.39

To: Yann Dupont <Yann.Dupont@xxxxxxxxxxxxxx>
Subject: Re: Bad performance with XFS + 2.6.38 / 2.6.39
From: Yann Dupont <Yann.Dupont@xxxxxxxxxxxxxx>
Date: Mon, 02 Jan 2012 11:06:26 +0100
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, stan@xxxxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <4EF30E5D.7060608@xxxxxxxxxxxxxx>
References: <CACaf2aYZ=k=x8sPFJs4f-4vQxs+qNyoO1EUi8X=iBjWjRhy99Q@xxxxxxxxxxxxxx> <20111211233929.GI14273@dastard> <CACaf2aYTsxOBXEJEbQu7gwAminBc3R2usDHvypJW0AqOfnz0Pg@xxxxxxxxxxxxxx> <20111212010053.GM14273@dastard> <CACaf2ab-YjXAFm767MmRU5iuOmvkqQW3ZTfQewD5SGvF-opgYQ@xxxxxxxxxxxxxx> <4EF1A224.2070508@xxxxxxxxxxxxxx> <4EF1F6DD.8020603@xxxxxxxxxxxxxxxxx> <4EF21DD2.3060004@xxxxxxxxxxxxxx> <20111221222623.GF23662@dastard> <4EF2F702.4050902@xxxxxxxxxxxxxx> <4EF30E5D.7060608@xxxxxxxxxxxxxx>
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Le 22/12/2011 12:02, Yann Dupont a écrit :
Le 22/12/2011 10:23, Yann Dupont a écrit :

Can you run a block trace on both kernels (for say five minutes)
when the load differential is showing up and provide that to us so
we can see how the IO patterns are differing?

here we go.

Hello, happy new year everybody ,

Did someone had time to examine the 2 blktrace ? (and, by chance, can see the root cause of the increased load ?)

One of my server is still running 3.1.6. In the coming days I'll see a very important load increase (today is still calm). Is there anything I can do to go further ?


Yann Dupont - Service IRTS, DSI Université de Nantes
Tel : - Mail/Jabber : Yann.Dupont@xxxxxxxxxxxxxx

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