From: "Dieter Nützel" <Dieter.Nuetzel@hamburg.de>
To: Daniel Phillips <phillips@bonn-fries.net>,
Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org (Linux Kernel List),
reiserfs-list@namesys.com (ReiserFS List),
mason@suse.com (Chris Mason),
NikitaDanilov@Yahoo.COM (Nikita Danilov),
tmv5@home.com (Tom Vier)
Subject: Re: 2.4.7-ac4 disk thrashing
Date: Wed, 8 Aug 2001 18:03:36 +0200 [thread overview]
Message-ID: <20010808161334Z270517-28344+3065@vger.kernel.org> (raw)
In-Reply-To: <E15UR2B-00051d-00@the-village.bc.nu> <01080817411402.00351@starship>
In-Reply-To: <01080817411402.00351@starship>
Am Mittwoch, 8. August 2001 17:41 schrieb Daniel Phillips:
> On Wednesday 08 August 2001 12:57, Alan Cox wrote:
> > > Could it be that the ReiserFS cleanups in ac4 do harm?
> > > http://marc.theaimsgroup.com/?l=3Dreiserfs&m=3D99683332027428&w=3D2
> >
> > I suspect the use once patch is the more relevant one.
>
> Two things to check:
>
> - Linus found a bug in balance_dirty_state yesterday. Is the
> fix applied?
No, I'll try.
> - The original use-once patch tends to leave a referenced pages
> on the inactive_dirty queue longer, not in itself a problem,
> but can expose other problems. The previously posted patch
> below fixes that, is it applied?
>
> To apply (with use-once already applied):
Yes, it was with -ac9.
But it wasn't much different from ac6/7/8 without it. All nearly "equally
bad". The disk steps like mad compared against 2.4.7-ac1 and ac-3. I can
"hear" it and the whole system "feels" slow.
2.4.7-ac1 + transaction-tracking-2 (Chris) + use-once-pages
(Daniel) + 2.4.7-unlink-truncate-rename-rmdir.dif (Nikita) is the best Linux
I've ever run.
I did several (~10 times) dbench-1.1 (should I retry with dbench-1.2?) and
all gave nearly same results.
ac-1, ac3 + fixes GREAT
ac5, ac6, ac7, ac8, ac9 + fixes BAD
Thanks,
Dieter
> cd /usr/src/your.2.4.7.source.tree
> patch -p0 <this.patch
>
> --- ../2.4.7.clean/mm/filemap.c Sat Aug 4 14:27:16 2001
> +++ ./mm/filemap.c Sat Aug 4 23:41:00 2001
> @@ -979,9 +979,13 @@
>
> static inline void check_used_once (struct page *page)
> {
> - if (!page->age) {
> - page->age = PAGE_AGE_START;
> - ClearPageReferenced(page);
> + if (!PageActive(page)) {
> + if (page->age)
> + activate_page(page);
> + else {
> + page->age = PAGE_AGE_START;
> + ClearPageReferenced(page);
> + }
> }
> }
next prev parent reply other threads:[~2001-08-08 16:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-08 6:38 2.4.7-ac4 disk thrashing Dieter Nützel
2001-08-08 10:57 ` Alan Cox
2001-08-08 15:41 ` Daniel Phillips
2001-08-08 16:03 ` Dieter Nützel [this message]
2001-08-13 6:24 ` 2.4.7-ac4 disk thrashing (SOLVED?) Dieter Nützel
-- strict thread matches above, loose matches on Subject: below --
2001-08-04 15:38 2.4.7-ac4 disk thrashing Tom Vier
2001-08-04 23:04 ` Matthew Gardiner
2001-08-05 0:55 ` Tom Vier
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