lkml.org 
[lkml]   [2007]   [Dec]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 00/20] VM pageout scalability improvements
On Mon, 24 Dec 2007 04:29:36 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> Rik van Riel wrote:

> > In the real world, users with large JVMs on their servers, which
> > sometimes go a little into swap, can trigger this system. All of
> > the CPUs end up scanning the active list, and all pages have the
> > referenced bit set. Even if the system eventually recovers, it
> > might as well have been dead.
> >
> > Going into swap a little should only take a little bit of time.
>
> Very fascinating, so we need to scale better with larger memory.
> I suspect part of the answer will lie with using large/huge pages.

Linus vetoed going to a larger soft page size, with good reason.

Just look at how much the 64kB page size on PPC64 sucks for most
workloads - it works for PPC64 because people buy PPC64 monster
systems for the kinds of monster workloads that work well with a
large page size, but it definately isn't general purpose.


\
 
 \ /
  Last update: 2007-12-24 02:17    [W:0.150 / U:0.880 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site