lkml.org 
[lkml]   [2005]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] mm - implement swap prefetching
Date
On Tue, 11 Oct 2005 00:35, Jesper Juhl wrote:
> On 10/10/05, Con Kolivas <kernel@kolivas.org> wrote:
> > Andrew could you please consider this for -mm
> >
> > Small changes to the style after suggestions from Pekka Enberg (thanks),
> > and changed the default size of prefetch to gently increase with size of
> > ram. Functionally this is the same code as vm-swap_prefetch-15 and I
> > believe ready for a wider audience.
>
> + What this will do on workstations is slowly bring back applications
> + that have swapped out after memory intensive workloads back into
> + physical ram if you have free ram at a later stage and the machine
> + is relatively idle. This means that when you come back to your
> + computer after leaving it idle for a while, applications will come
> + to life faster. Note that your swap usage will appear to increase
> + but these are cached pages, can be dropped freely by the vm, and it
> + should stabilise around 50% swap usage.
> +
> + Desktop users will most likely want to say Y.
>
> How about a little note about the impact for server users as well?
> You recommend that desktop users enable this, but you don't give any
> recommendation for servers.

Your guess is as good as mine. I can easily demonstrate a benefit when using
it with desktop workloads but a server? It's not expensive to run but I don't
really know if it's advantageous either. If I had to take a guess, a server
that had multiple user logins running applications would benefit, but
database, web servers etc I doubt would benefit.

Cheers,
Con
-
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: 2005-10-10 16:43    [W:0.075 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site