Re: Reiser4 unlink performance

[Alexander Zarochentsev <zam@namesys.com>]

On Tuesday 28 February 2006 23:42, Hans Reiser wrote:
> Alexander Zarochentsev wrote:
> >On Tuesday 28 February 2006 22:56, Hans Reiser wrote:
> >>Alexander Zarochentsev wrote:
> >>>On Tuesday 28 February 2006 22:11, Hans Reiser wrote:
> >>>>Alec H. Peterson wrote:
> >>>>>Hi Alexander,
> >>>>>
> >>>>>On Feb 26, 2006, at 13:42, Alexander Zarochentsev wrote:
> >>>>>>Which kernel version and reiser4 patches were used?
> >>>>>
> >>>>>2.6.15.4r4 kernel,
> >>>>>reiser4-for-2.6.15-1.patch
> >>>>>
> >>>>>>Is the system SMP?
> >>>>>
> >>>>>Yes.
> >>>>>
> >>>>>>No, "Flushing like mad" usually indicates a bug.
> >>>>
> >>>>Please describe it in more detail.
> >>>
> >>>The flush algorithm designed to make progress in any iteration.
> >>>"flushing like mad" messages usually indicates that the flush
> >>> can't make progress.
> >>
> >>Yet more detail please.
> >
> >the algorithm does not work as designed, it is a design bug or an
> >implementation bug ;)
>
> I seem to remember vs saying this message could be ignored safely at
> times in the past, which is why I am asking you for more details.

We have improved handling of truncate/flush races, especially if 
formatted nodes are deleted.  Now I think that any truncate/flush race 
can be resolved w/o having those too many useless iterations of 
jnode_flush.

> Hans

-- 
Alex.