Mixed Read / Write Workloads
In this series of tests, we measure mixed workload performance. We start with 100% read and then add data writes to the mix until we get to 100% writes, in 10% increments. We believe this will be the next major area SSD manufacturers will address after performance consistency.
Mixed Workload Bandwidth
This is the debut for this benchmark on the pages of TweakTown, at least for the consumer SSD reviews anyway. What we see is a bathtub curve as the drives work through mixed workloads. Mixed workloads means reads and writes at the same time. We first started looking at this a few months back when we noticed some odd behavior on the Samsung XP941 (a PCIe 2.0 x4 OEM SSD). PCIe SSDs should be full-duplex, they can read and write at the same time. SATA drives are only half-duplex, they can read and write, but not at the same time.
As you can see here, the two M.2 PCIe SSDs have problems reading and writing at the same time. After we get more results, we'll pull the PCIe M.2 drives from this chart and replace them with more SATA drives. The results also show one of the hidden reasons why LSI SandForce drives (like the Intel Pro 2500 shown here with 50% entropy) always feel much faster than what most benchmarks lead us to believe.
Our focus today though is the Crucial MX100 256GB. The drive starts doing very well with 100% read but as soon as we add 10% writes, the performance drops to less than 200 MB/s. The performance never recovers to complete the bathtub curve because we're testing in steady state.
80% Read / 20% Write Bandwidth
We found that the 80/20 mix is a good measuring point for consumers. 70/30 for prosumer environments. In this chart we plot the 80/20 mix with the 256GB class drives we've tested to date. The Crucial MX100 is the least desirable, but it's also the only mainstream price class drive in the chart. We'll expand this data in the coming weeks.
Mixed Workload Response Time
Here we see the latency results from the same tests under the same conditions. This is measured in milliseconds and shows the average time from multiple runs at each mix.
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