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SubjectRe: CONFIG_PREEMPT and server workloads
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
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