|| ||Linus Torvalds <torvalds-AT-linux-foundation.org> |
|| ||Andrew Morton <akpm-AT-linux-foundation.org> |
|| ||Re: Linux 2.6.29 |
|| ||Thu, 26 Mar 2009 20:38:43 -0700 (PDT)|
|| ||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 Thu, 26 Mar 2009, Andrew Morton wrote:
> Why does everyone just sit around waiting for the kernel to put a new
> value into two magic numbers which userspace scripts could have set?
> My /etc/rc.local has been tweaking dirty_ratio, dirty_background_ratio
> and swappiness for many years. I guess I'm just incredibly advanced.
.. and as a result you're also testing something that nobody else is.
Look at the complaints from people about fsync behavior that Ted says he
cannot see. Let me guess: it's because Ted probably has tweaked his
environment, because he is advanced. As a result, other people see
problems, he does not.
That's not "advanced". That's totally f*cking broken.
Having different distributions tweak all those tweakables is just even
_more_ so. It's the anti-thesis of "advanced". It's just stupid.
We should aim to get it right. The "user space can tweak any numbers they
want" is ALWAYS THE WRONG ANSWER. It's a cop-out, but more importantly,
it's a cop-out that doesn't even work, and that just results in everybody
having different setups. Then nobody is happy.
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