Messages in this thread | | | Date | Fri, 19 Mar 2004 10:03:11 -0800 | From | Andrew Morton <> | Subject | Re: 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 - 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/
| |