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.
If this is cache miss related then a larger page order may take are of this. Boot with (assume you got 2.6.21-mm1 at least...) slub_min_order=6 slub_max_order=7 which will give you an allocation unit of 256k. Just tried it. It actually works but has no effect here whatsoever on UP netperf performance. netperf performance dropped from 6MB(slab)/6.2MB(slub) on 2.6.21-rc7-mm1 to 4.5MB (both) on 2.6.21-mm1. So I guess there is something also going on with the networking layer. Still have not found a machine here where I could repeat your results. - 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/
