* 2.4.9 VM/VMA subsystem works much better
@ 2001-08-22 19:58 Brad Chapman
2001-08-23 3:18 ` Daniel Phillips
0 siblings, 1 reply; 3+ messages in thread
From: Brad Chapman @ 2001-08-22 19:58 UTC (permalink / raw)
To: linux-kernel
Everyone,
Just a note: the VMA sanity patch which went in to 2.4.9
has improved Mozilla's performance considerably. I did a rough
calculation based on startup time and found that Mozilla started
approximately 10%-12% faster on 2.4.9 then 2.4.8. Plus, I've
found that swapping is actually starting to work again, although
it still tends to stick at certain times.
Great job everyone.
Brad
=====
Brad Chapman
Permanent e-mail: kakadu_croc@yahoo.com
Current e-mail: kakadu@adelphia.net
Alternate e-mail: kakadu@netscape.net
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: 2.4.9 VM/VMA subsystem works much better
2001-08-22 19:58 2.4.9 VM/VMA subsystem works much better Brad Chapman
@ 2001-08-23 3:18 ` Daniel Phillips
[not found] ` <20010823122958.36fbd525.skraw@ithnet.com>
0 siblings, 1 reply; 3+ messages in thread
From: Daniel Phillips @ 2001-08-23 3:18 UTC (permalink / raw)
To: Brad Chapman, linux-kernel
On August 22, 2001 09:58 pm, Brad Chapman wrote:
> Everyone,
>
> Just a note: the VMA sanity patch which went in to 2.4.9
> has improved Mozilla's performance considerably. I did a rough
> calculation based on startup time and found that Mozilla started
> approximately 10%-12% faster on 2.4.9 then 2.4.8. Plus, I've
> found that swapping is actually starting to work again, although
> it still tends to stick at certain times.
>
> Great job everyone.
Make sure you have my SetPageReferenced patch in, swap is borked without
it.
--
Daniel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: 2.4.9 VM/VMA subsystem works much better
[not found] ` <20010823122958.36fbd525.skraw@ithnet.com>
@ 2001-08-23 18:22 ` Daniel Phillips
0 siblings, 0 replies; 3+ messages in thread
From: Daniel Phillips @ 2001-08-23 18:22 UTC (permalink / raw)
To: Stephan von Krawczynski, jlnance; +Cc: linux-kernel
On August 23, 2001 12:29 pm, Stephan von Krawczynski wrote:
> Daniel Phillips <phillips@bonn-fries.net> wrote:
>
> > On August 22, 2001 09:58 pm, Brad Chapman wrote:
> > > Everyone,
> > >
> > > Just a note: the VMA sanity patch which went in to 2.4.9
> > > has improved Mozilla's performance considerably. I did a rough
> > > calculation based on startup time and found that Mozilla started
> > > approximately 10%-12% faster on 2.4.9 then 2.4.8. Plus, I've
> > > found that swapping is actually starting to work again, although
> > > it still tends to stick at certain times.
> > >
> > > Great job everyone.
> >
> > Make sure you have my SetPageReferenced patch in, swap is borked without
> > it.
>
> Can you send me the patches you think should cure a straight 2.4.9 for
> re-testing (probably the one from Marcelo Tosatti, too).
> I am from the old school: don't believe what you can't test. :-)
I took the liberty of cc'ing this to the list. This patch fixes a severe
swap thrashing problem that was introduced by the use-once patch in 2.4.8. I
explained the details elsewhere. Other than the swap problem (which was just
an oversight, not a design error) the use-once strategy seems to be working
fine. My own anecdotal evidence: before, dpkg --config -a on this box was
effectively a DoS, now I barely notice it while I'm running other
applications.
There should be a similar hole in pagemap_nopage affecting memmapped files,
but nobody has reported it yet. I presume this is because it's a lot harder
to trigger. I'll supply a patch after I've looked at it a little more.
--- ../2.4.9.clean/mm/memory.c Mon Aug 13 19:16:41 2001
+++ ./mm/memory.c Sun Aug 19 21:35:26 2001
@@ -1119,6 +1119,7 @@
*/
return pte_same(*page_table, orig_pte) ? -1 : 1;
}
+ SetPageReferenced(page);
}
/*
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2001-08-22 19:58 2.4.9 VM/VMA subsystem works much better Brad Chapman
2001-08-23 3:18 ` Daniel Phillips
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2001-08-23 18:22 ` Daniel Phillips
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