lkml.org 
[lkml]   [2007]   [Mar]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC] i386: Remove page sized slabs for pgds and pmds
On Wed, 28 Mar 2007, Andrew Morton wrote:

> I would like to test qlhack on ia64, because ia64 puts pte-pages into the
> quicklists as well, but my ia64 machine is presently indisposed.

Its probably easier to set the number of cached pages to one.

> My (much) preferred way to handle all this is to remove the quicklists from
> all architectures: just use alloc_page() and free_page() for pte pages, pmd
> pages, etc. I remain unaware of any testing whcih indicates that this
> would be a bad change.

Tried this also on x86_64 with an enhanced quicklist patch that also deals
with ptes (at the price of not guaranteeing the free after the tlb flush):

quicklist:

real 8m56.787s
user 7m46.380s
sys 0m55.910s

real 8m58.326s
user 7m46.030s
sys 0m56.250s

real 8m56.900s
user 7m46.620s
sys 0m55.570s

no quicklist:

real 9m7.798s
user 7m48.340s
sys 0m58.360s

real 8m58.994s
user 7m47.980s
sys 0m54.870s

real 8m58.533s
user 7m48.030s
sys 0m54.150s

Seems that there is a slight benefit but its also barely above noise
level.

-
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: 2007-03-28 23:09    [W:0.291 / U:0.176 seconds]
©2003-2011 Jasper Spaans. Advertise on this site