Re: [vm] writing to UDF DVD+RW (/dev/sr0) while under memorypressure: box ==> doorstop

[Mike Galbraith]

On Tue, 2008-01-08 at 16:21 +0100, Mike Galbraith wrote:
> On Tue, 2008-01-08 at 03:38 -0800, Andrew Morton wrote:
> > 
> > Well.  From your earlier trace it appeared that something was causing
> > the filesystem to perform synchronous inode writes - sync_dirty_buffer() was
> > called.
> > 
> > This will cause many more seeks than would occur if we were doing full
> > delayed writing, with obvious throughput implications.
> 
> Yes, with UDF, the IO was _incredibly_ slow.  With ext2, it was better,
> though still very bad.  I tested with that other OS, and it gets ~same
> throughput with UDF as I got with ext2 (ick).
> 
> UDF does udf_clear_inode() -> write_inode_now(inode, 1)
> 
> I suppose I could try write_inode_now(inode, 0).  Might unstick the box.

(nope, still sync, UDF still deadly)

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