On Tue, Oct 06 2009, Nick Piggin wrote: > Hi, > > Several people have been interested to test my vfs patches, so rather > than resend patches I have uploaded a rollup against Linus's current > head. > > ftp://ftp.kernel.org/pub/linux/kernel/people/npiggin/patches/fs-scale/ > > I have used ext2,ext3,autofs4,nfs as well as in-memory filesystems > OK (although this doesn't mean there are no bugs!). Otherwise, if your > filesystem compiles, then there is a reasonable chance of it working, > or ask me and I can try updating it for the new locking. > > I would be interested in seeing any numbers people might come up with, > including single-threaded performance. I gave this a quick spin on the 64-thread nehalem. Just a simple dbench with 64 clients on tmpfs. The results are below. While running perf top -a in mainline, the top 5 entries are: 2086691.00 - 96.6% : _spin_lock 14866.00 - 0.7% : copy_user_generic_string 5710.00 - 0.3% : mutex_spin_on_owner 2837.00 - 0.1% : _atomic_dec_and_lock 2274.00 - 0.1% : __d_lookup Uhm auch... It doesn't look much prettier for the patch kernel, though: 9396422.00 - 95.7% : _spin_lock 66978.00 - 0.7% : copy_user_generic_string 43775.00 - 0.4% : dput 23946.00 - 0.2% : __link_path_walk 17699.00 - 0.2% : path_init 15046.00 - 0.2% : do_lookup Anyway, below are the results. Seem very stable. throughput ------------------------------------------------ 2.6.32-rc3-git | 561.218 MB/sec 2.6.32-rc3-git+patch | 627.022 MB/sec -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
