Date: Fri, 3 Mar 2006 12:32:22 -0800
From: Andrew Morton <akpm@osdl.org>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/4] map multiple blocks in get_block() and
 mpage_readpages()
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Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> On Wed, 2006-03-01 at 17:52 -0800, Andrew Morton wrote:
> > Badari Pulavarty <pbadari@us.ibm.com> wrote:
> > >
> > > I noticed decent improvements (reduced sys time) on JFS, XFS and ext3.
> > > (on simple "dd" read tests).
> > > 
> > >          (rc3.mm1)      (rc3.mm1 + patches)
> > > real    0m18.814s       0m18.482s
> > > user    0m0.000s        0m0.004s
> > > sys     0m3.240s        0m2.912s
> > 
> > With which filesystem?  XFS and JFS implement a larger-than-b_size
> > ->get_block, but ext3 doesn't.  I'd expect ext3 system time to increase a
> > bit, if anything?
> 
> These numbers are on JFS. With the current ext3 (mainline) - I did
> find not-really-noticible increase in sys time (due to code overhead).
> 
> I tested on ext3 with Mingming's ext3 getblocks() support in -mm also,
> which showed reduction in sys time.
> 

OK, no surprises there.  Things will improve when someone gets around to
doing multi-block get_block for ext3.
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