[Beowulf] Rackable / SGI

Chris Samuel csamuel at vpac.org
Sun Apr 19 05:37:44 PDT 2009

----- "Greg Lindahl" <lindahl at pbm.com> wrote:

> On Fri, Apr 03, 2009 at 08:15:06PM -0400, Joe Landman wrote:
> > Ext3 has some serious performance limits due to its
> > journaling design.  Never mind its other issues.
> If you use the default desktop config, yes. This is a common
> situation in lifestyle arguments: "performance would be poor
> if you use product X like an idiot." It's an ease-of-use problem.

No, these are fundamental issues that will (hopefully)
be solved in 2.6.30, mainly to do with ext3's fsync()
and interactions with the CFQ scheduler and resulted in
the creation of the WRITE_SYNC_PLUG operation to help
with that.

Oh, and from 2.6.30 ext3 will default to data=writeback, if
you want the old data=ordered you'll need to explicitly ask
for it (another performance improvement).

Christopher Samuel - (03) 9925 4751 - Systems Manager
 The Victorian Partnership for Advanced Computing
 P.O. Box 201, Carlton South, VIC 3053, Australia
VPAC is a not-for-profit Registered Research Agency

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