linux-kernel - Re: 2.6.36 and higher version kernel slower than 2.6.25.1 kernel?

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Message-ID: <20120307194728.GA26341@kroah.com>
Date:	Wed, 7 Mar 2012 11:47:28 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Xiachen Dong <xiachendong@...mail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.36 and higher version kernel slower than 2.6.25.1 kernel?

On Wed, Mar 07, 2012 at 12:04:33PM -0500, Xiachen Dong wrote:
> 
> Hi,
> 
> Recently we upgrade the OS for our AT91RM9200 platform from 2.6.25.1
> to 2.6.36. We run the SQLITE3 database insertion tests for the new
> kernel. The test result shows that 2.6.36 kernel is around 10% slower
> than the 2.6.25.1.

Ick.

As you noted this is still present in 3.0.23, any chance to try out
3.2.9?

And as you seem to have a good reproducable test, can you run 'git
bisect' between 2.6.35 and 2.6.36 to find the patch that causes this
problem so we can work on resolving it?

thanks,

greg k-h
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