Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:I did nobh option only for writeback mode + only if PAGE_SIZE == blocksize case :(
On Fri, 2006-03-10 at 00:23 -0800, Andrew Morton wrote:
> Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
> >
> > > > > I'm not sure that PageMappedToDisk() gets set in all the right places
> > > though - it's mainly for the `nobh' handling and block_prepare_write()
> > > would need to be taught to set it. I guess that'd be a net win, even if
> > > only ext3 uses it..
> > > > btw is nobh mature enough yet to become the default, or to just go away
> > entirely as option ?
> > I don't know how much usage it's had, sorry. It's only allowed in
> data=writeback mode and not many people seem to use even that.
would you be prepared to turn it on by default in -mm for a bit to see
how it holds up?
spose so. One would have to test it a bit first, make sure that it still
works. Performance testing with PAGE_SIZE much-greater-than blocksize
would be needed.
Unfortunately there's no `-o bh' (nonobh?) to turn it back on again if it
causes problems..