Re: [Ext2-devel] Re: [PATCH] 2.6.11-mm3 patch for ext3 writeback"nobh" option

From: Badari Pulavarty
Date: Tue Mar 15 2005 - 11:21:00 EST

On Mon, 2005-03-14 at 18:09, Andrew Morton wrote:
> Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:
> >
> > Here is the 2.6.11-mm3 version of patch for adding "nobh"
> > support for ext3 writeback mode.
> Care to update Documentation/filesystems/ext3.txt?

Yes. I will do that. I am planning to add "nobh" support to
ext3 ordered mode also, since its the default one. We need
to modify generic interfaces like mpage_writepage(s) to
keep track of bio count and make journal code wait for them etc. -
at that point the "generic" code will no longer be generic.
I am thinking of a way to do it *less* intrusively.

At that point, we can make "nobh" default option. (which
needs less documentation).

> > Can you include it in -mm ?
> Spose so.
> Did you have performance and resource consumption numbers to justify it? I
> think I asked that before and promptly forgot the answer, which is a good
> reason for taking some care over changelog maintenance...

The initial numbers showed 5-7% throughput improvements. I will send out
resource consumption numbers once I complete my regression tests.

Yep. I will update the changelog also.


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