Re: [PATCH] bump up nr_to_write in xfs_vm_writepage

Christoph Hellwig
2009-07-07T14:44:54Z

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.