QLogic 8200 Series is the Adapter of Choice for Converged Data Centers - Manual (Page 5)

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Figure 6. Bi-directional I/O Throughput with Increasing Workloads
in the bi-directional NiC failover test, the QLogic adapter required
substantially less CPU resources than the emulex adapter to drive more
data. in fact, the QLogic adapter used on average a little more than five
percent of the CPU—180 percent less than the amount the emulex adapter
required (Figure 7).
Figure 7. CPU Usage in a Teamed I/O Environment
Due to their low overhead, QLogic adapters leave the host server with plenty
of CPU resources for the server to efficiently scale. this will be imperative
in next-generation data centers that run converged networks and/or VMs.
this becomes even more evident when considering the throughput
normalized by the percentage of the CPU that is required to drive the i/O
(Figure 8).
Figure 8. Bi-directional I/O CPU Efficiency with Increasing Workloads
FCoe test results
to evaluate FCoe storage i/O performance, QLogic created a real-world test
scenario to verify an adapter’s ability to deliver high throughput rates while
minimizing CPU utilization. Using this standard testing philosophy, QLogic
tested our 8200 Series Converged Network adapter against emulex’s UCNa
within a Windows Server
® 2008 environment, with a focus on comparing
iOPS relative to CPU utilization. Measurements were done for throughput
(MBps) across real-world block sizes of 4 and 8KB and a comparison
was performed of the percentage of CPU utilization required to drive the
i/O. tests results are reported as MBps divided by the percentage of CPU
utilization to obtain the CPU efficiency. a higher number indicates more
efficient use of CPU resources.
in Figure 9, a Converged Network adapter from each company was used
to obtain performance results for sequential read, sequential write, and
sequential read/write i/O operations. Block sizes of 4 and 8KB, which
are typical of exchange and database workloads, were measured, and the
results show that the QLogic 8200 Series adapter significantly outperforms
the emulex adapter.
the data confirms that with sequential 8KB read/write block sizes, which
simulate application workloads for Oracle
® and Microsoft exchange ® 2007,
the QLogic 8200 Converged Network adapter holds a 54 percent CPU
efficiency advantage over the emulex UCNa.
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