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SubjectRe: [PATCH 0/4] map multiple blocks in get_block() and mpage_readpages()
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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