|| ||Andrew Morton <akpm-AT-linux-foundation.org> |
|| ||Linus Torvalds <torvalds-AT-linux-foundation.org> |
|| ||Re: Linux 2.6.29 |
|| ||Thu, 26 Mar 2009 17:11:48 -0700|
|| ||Theodore Tso <tytso-AT-mit.edu>, David Rees <drees76-AT-gmail.com>,
Jesper Krogh <jesper-AT-krogh.cc>,
Linux Kernel Mailing List <linux-kernel-AT-vger.kernel.org>|
|| ||Article, Thread
On Wed, 25 Mar 2009 16:23:08 -0700 (PDT) Linus Torvalds <email@example.com> wrote:
> On Wed, 25 Mar 2009, Theodore Tso wrote:
> > >
> > > The problem being that unlike the ratio, there's no sane default value
> > > that you can at least argue is not _entirely_ pointless.
> > Well, if the maximum time that someone wants to wait for an fsync() to
> > return is one second, and the RAID array can write 100MB/sec
> How are you going to tell the kernel that the RAID array can write
> The kernel has no idea.
userspace can do it quite easily. Run a self-tuning script after
installation and when the disk hardware changes significantly.
It is very disappointing that nobody appears to have attempted to do
_any_ sensible tuning of these controls in all this time - we just keep
thrashing around trying to pick better magic numbers in the base kernel.
Maybe we should set the tunables to 99.9% to make it suck enough to
to post comments)