lkml.org 
[lkml]   [2007]   [Jun]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Change in default vm_dirty_ratio


On Wed, 20 Jun 2007, Peter Zijlstra wrote:
>
> Building on the per BDI patches, how about integrating feedback from the
> full-ness of device queues. That is, when we are happily doing IO and we
> cannot possibly saturate the active devices (as measured by their queue
> never reaching 75%?) then we can safely increase the total dirty limit.

The really annoying things are the one-off things. You've been happily
working for a while (never even being _close_ to saturatign any IO
queues), and then you untar a large tree.

If the kernel now let's you dirty lots of memory, you'll have a very
unpleasant experience.

And with hot-pluggable devices (which is where most of the throughput
problems tend to be!), the "one-off" thing is not a "just after reboot"
kind of situation.

So you'd have to be pretty smart about it.

Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-06-20 19:21    [W:0.075 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site