Re: ext3_ordered_writepage() questions

[Mingming Cao <cmm@us.ibm.com>]

On Fri, 2006-03-17 at 14:38 -0800, Badari Pulavarty wrote:
> On Fri, 2006-03-17 at 17:22 -0500, Stephen C. Tweedie wrote:

> > There is one other perspective to be aware of, though: the current
> > behaviour means that by default ext3 generally starts flushing pending
> > writeback data within 5 seconds of a write.  Without that, we may end up
> > accumulating a lot more dirty data in memory, shifting the task of write
> > throttling from the filesystem to the VM.  
> 
> Hmm.. You got a point there. 
> 
> > 
> > That's not a problem per se, just a change of behaviour to keep in mind,
> > as it could expose different corner cases in the performance of
> > write-intensive workloads.
> > 
> > --Stephen
> > 
> > 
> 

Current data=writeback mode already behaves like this, so the VM
subsystem should be tested for a certain extent, isn't?

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