On 11/26/2013 07:25 AM, Chris Burroughs wrote:
As far as I can tell from AMD docs and Vincent's handy /sys trick, each
of the 6 cores has a fully independent L2 cache, and the chip has a
single shared L3 cache.
I'm not sure I'm following the part about the "same part of the L3
cache". Are you saying that some cores are "closer" to each other on
the L3 cache, like NUMA?
These CPUs seem to be designed for VM hosting, or running highly
threaded Java apps which don't need much FPU. I'm not certain they
were optimized for network processing unfortunately, which is sad
considering that their older brothers were extremely fast at that.
"Highly threaded Java apps" happens to be what most of our servers are
used for and what we benchmarked for purchasing decisions.
We happen to have another CPU we purchased to be good with highly
threaded Java apps: Intel Xeon CPU E5-2670 0 @ 2.60GHz
It also has a L2 cache per core. This CPU has performed significantly
better in both "many" and "a few" threaded workloads. Somewhat
surprisingly with a single haproxy I'm only able to get to around 23 k
req/s (vs 20k with the much older Opteron).
