On Mon, 2007-05-07 at 18:49 -0700, Christoph Lameter wrote: > On Mon, 7 May 2007, Tim Chen wrote: > > > However, the output from TCP_STREAM is quite stable. > > I am still seeing a 4% difference between the SLAB and SLUB kernel. > > Looking at the L2 cache miss rate with emon, I saw 6% more cache miss on > > the client side with SLUB. The server side has the same amount of cache > > miss. This is test under SMP mode with client and server bound to > > different core on separate package. > > Could you try the following patch on top of 2.6.21-mm1 with the patches > from http://ftp.kernel.org/pub/linux/kernel/people/christoph/slub-patches? > > I sent it to you before. This is one is an updated version > > > > Avoid atomic overhead in slab_alloc and slab_free >
I tried the slub-patches and the avoid atomic overhead patch against 2.6.21-mm1. It brings the TCP_STREAM performance for SLUB to the SLAB level. The patches not mentioned in the "series" file did not apply cleanly to 2.6.21-mm1 and I skipped most of those. Patches applied are: http://ftp.kernel.org/pub/linux/kernel/people/christoph/slub- patches/series + dentry_target_reclaimed + kmem_cache_ops + slub_stats + skip_atomic_overhead Without skip atomic overhead patch, the throughput drops by 1 to 1.5%. The change from slub_min_order=0 slub_max_order=4 to slub_min_order=6 slub_max_order=7 did not make much difference in my tests. Tim - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/