I just got back from vacation and noticed that two patchsets have been released that greatly improve Innodb performance! Maybe I need to take more breaks

Yasufumi Kinoshita's patches

Percona recently released a patch which includes performance fixes developed by Yasufumi Kinoshita from NTT Comware. This helps diskbound applications quite significantly. Details at Bug #29413 Maximum performance of OLTP benchmark is not so scalable on multi-cpu. It looks like the bulk of performance improvements come from breaking up the lock guarding the buffer pool structures, and improvements in the IO code path. The "buf_pool->mutex" also gets quite hot when concurrency is not limited (via innodb_thread_concurrency) and you have multiple threads executing on multi-core systems.

Updated Google patch

Google recently released an updated patch for improving Innodb scalability. My experience with this patch shows a significant scalability improvement for many workloads. Great work Mark, Ben and rest of the gang!

This is excellent news! This clearly demonstrates that we (as a community) are making great progress in making MySQL scale. This also underlines the fact that the choice of the storage engine will influence your scalability experience quite a bit. This also sets the bar higher for Falcon and Maria (A good thing in my opinion)