Re: [PATCH] bump up nr_to_write in xfs_vm_writepage

Olaf Weber
2009-07-07T11:37:01Z

Christoph Hellwig writes:
> On Tue, Jul 07, 2009 at 11:07:30AM +0200, Olaf Weber wrote:

>> If the nr_to_write calculation really yields a value that is too
>> small, shouldn't it be fixed elsewhere?

> 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.

--
Olaf Weber SGI Phone: +31(0)30-6696752
Veldzigt 2b Fax: +31(0)30-6696799
Technical Lead 3454 PW de Meern Vnet: 955-7151
Storage Software The Netherlands Email: olaf@sgi.com