Authored by John Beckett, Solutions Performance Analysis

Dell PowerEdge customers who wish to optimize their memory subsystem for performance now have a great new resource to use.  The Memory Performance Guidelines for Dell PowerEdge 12th Generation Servers whitepaper has recently been released, and anyone interested in the factors that impact memory performance is encouraged to read it.   The document is primarily intended for 12th Generation PowerEdge servers that use the Intel Xeon E5-2600-series processors, but many conclusions can apply to Xeon E5-2400 servers as well.

This document goes into great detail in the following areas, using a variety of standard server benchmarks as well as memory bandwidth and memory latency measurements to characterize performance effects:

  1. DDR3 memory types (UDIMMs, RDIMMs, LRDIMMs) compared for performance and power
  2. BIOS option (Memory Operating Mode and Node Interleave) effects
  3. Memory frequency effects on performance and power
  4. Memory channel population effects on performance
  5. Balanced vs. unbalanced configuration effects of performance

Other topics of interest include a discussion of NUMA and affinitization, processor influence on memory bandwidth, and DIMM rank effects on performance.

Most of the comparisons done for this whitepaper characterize memory bandwidth, memory latency, integer workloads and floating point workloads for each configuration tested.  The wealth of data presented here should be helpful in determining the optimal memory configuration for various real-world workloads, but as always, your mileage may vary.

A few sample comparisons to whet your appetite:

Advanced ECC performance effects compared with Memory Optimizer Mode

Memory Frequency Effects on Integer Workloads

Quad Rank RDIMMs vs. LRDIMMs in a 2 DIMM per Channel Configuration – Memory Latency

Any customer who is interested in optimizing their 12th Generation PowerEdge server’s memory performance will find this whitepaper to be a useful resource.
We encourage any feedback that you might have regarding the helpfulness of the data presented, and look forward to hearing from you!