From: Andrew Morton <akpm@osdl.org>
To: dipankar@in.ibm.com
Cc: tiwai@suse.de, andrea@suse.de, mjy@geizhals.at,
linux-kernel@vger.kernel.org
Subject: Re: CONFIG_PREEMPT and server workloads
Date: Fri, 19 Mar 2004 10:03:11 -0800 [thread overview]
Message-ID: <20040319100311.5aa11733.akpm@osdl.org> (raw)
In-Reply-To: <20040319172203.GB4537@in.ibm.com>
Dipankar Sarma <dipankar@in.ibm.com> wrote:
>
> On Thu, Mar 18, 2004 at 10:10:06PM -0800, Andrew Morton wrote:
> > The worst-case latency is during umount, fs/inode.c:invalidate_list() when
> > the filesystem has a zillion inodes in icache. Measured 250 milliseconds
> > on a 256MB 2.7GHz P4 here. OK, so don't do that.
> >
> > The unavoidable worst case is in the RCU callbacks for dcache shrinkage -
> > I've seen 25 millisecond holdoffs on the above machine during filesystem
> > stresstests when RCU is freeing a huge number of dentries in softirq
> > context.
>
> What filesystem stresstest was that ?
Something which creates a lot of slab, and a bit of memory pressure
basically. Such as make-teeny-files from
http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz
next prev parent reply other threads:[~2004-03-19 18:04 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 4:00 Marinos J. Yannikos
2004-03-18 5:12 ` Andrew Morton
2004-03-18 6:03 ` Andrea Arcangeli
2004-03-18 9:50 ` Andrew Morton
2004-03-18 14:51 ` Andrea Arcangeli
2004-03-18 15:34 ` Robert Love
2004-03-18 16:01 ` Andrea Arcangeli
2004-03-18 17:39 ` Andrew Morton
2004-03-18 17:58 ` Andrea Arcangeli
2004-03-18 18:26 ` Andrew Morton
2004-03-18 18:38 ` Andrea Arcangeli
2004-03-18 18:47 ` Andrew Morton
2004-03-18 19:01 ` Andrea Arcangeli
2004-03-18 17:48 ` Robert Love
2004-03-18 18:00 ` Andrea Arcangeli
2004-03-20 10:48 ` Jamie Lokier
2004-03-19 2:17 ` Nick Piggin
[not found] ` <20040319050948.GN2045@holomorphy.com>
2004-03-20 12:14 ` Andrea Arcangeli
2004-03-20 14:51 ` William Lee Irwin III
2004-03-20 15:03 ` Andrea Arcangeli
2004-03-20 15:09 ` William Lee Irwin III
2004-03-24 13:57 ` Takashi Iwai
2004-03-24 14:52 ` Andrea Arcangeli
2004-03-24 15:11 ` William Lee Irwin III
2004-03-18 15:20 ` Tom Sightler
2004-03-18 15:37 ` Andrea Arcangeli
2004-03-18 23:54 ` Tom Sightler
2004-03-18 15:39 ` Robert Love
2004-03-18 15:28 ` Takashi Iwai
2004-03-18 15:40 ` Robert Love
2004-03-18 15:42 ` Andrea Arcangeli
2004-03-18 19:01 ` Andrew Morton
2004-03-18 19:08 ` Takashi Iwai
2004-03-18 19:18 ` Andrew Morton
2004-03-18 19:20 ` Takashi Iwai
2004-03-18 19:43 ` Andrea Arcangeli
2004-03-18 19:50 ` Takashi Iwai
2004-03-18 19:24 ` Robert Love
2004-03-19 22:03 ` Valdis.Kletnieks
2004-03-19 22:12 ` Robert Love
2004-03-24 15:00 ` Takashi Iwai
2004-03-18 19:16 ` Takashi Iwai
2004-03-18 19:29 ` Andrew Morton
2004-03-18 19:48 ` Chris Mason
2004-03-19 11:37 ` Takashi Iwai
2004-03-19 13:46 ` Chris Mason
2004-03-19 14:06 ` Takashi Iwai
[not found] ` <20040318221006.74246648.akpm@osdl.org>
2004-03-19 10:30 ` Takashi Iwai
2004-03-23 9:14 ` Dipankar Sarma
2004-03-19 17:22 ` Dipankar Sarma
2004-03-19 18:03 ` Andrew Morton [this message]
2004-03-20 12:24 ` Andrea Arcangeli
2004-03-20 13:13 ` Dipankar Sarma
2004-03-18 19:39 ` Andrea Arcangeli
2004-03-18 22:32 ` Andrew Morton
2004-03-18 22:54 ` Chris Mason
2004-03-18 23:57 ` Andrew Morton
2004-03-19 20:46 ` Takashi Iwai
2004-03-19 21:08 ` Andrew Morton
2004-03-19 3:07 ` Eric St-Laurent
2004-03-19 11:23 ` Takashi Iwai
2004-03-19 13:35 ` Chris Mason
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