Re: [PATCH] bump up nr_to_write in xfs_vm_writepage

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Tue, Jul 07, 2009 at 01:37:05PM +0200, Olaf Weber wrote:
> > In theory it should.  But given the amazing feedback of the VM people
> > on this I'd rather make sure we do get the full HW bandwith on large
> > arrays instead of sucking badly and not just wait forever.
> 
> So how do you feel about making the fudge factor tunable?  I don't
> have a good sense myself of what the value should be, whether the
> hard-coded 4 is good enough in general.

A tunable means exposing an ABI, which I'd rather not do for a hack like
this.  If you don't like the number feel free to experiment around with
it, SGI should have enough large systems that can be used to test this
out.