HP Server rp4440 TCP Segmentation Offload (TSO) Performance On HP rp4440 Serve - Page 5

rp4440 Performance with GigE and TSO, Service Demand, Throughput

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rp4440 Performance with GigE and TSO rp4440 Performance with GigE and TSO Efficiency of the HP rp4440 server with TSO over PCI-X 2-port Gigabit Ethernet A7011A and A7012A cards is best demonstrated through tests that show: • Service Demand. Service demand is the amount of time (in microseconds) it takes one CPU to handle one kilobyte of data. It's a straightforward measurement because it eliminates disparities if comparisons are made with different quantities, types, or frequencies of CPUs. Service Demand is an important capacity planning & performance metric that is sometimes considered a better metric than CPU Utilization when comparing different server models. • Throughput. Throughput is the measure of the available bandwidth; in this article, it is shown for one-way transmission alone as well as the combination of transmit and receive throughput, also called bidirectional. It's an important metric of networking performance and server capacity sizing for optimal application performance. These measurements can help determine how well one or a series of batch programs will run with a certain workload or how many user requests can be handled. The performance gains in service demand and throughput shown in this article were measured with the netperf benchmarking software. The following charts show the overall performance of one, two, and four ports on up to 2 PCI-X 2-Port Gigabit Ethernet cards in a 4-way rp4440. TSO was measured with the following traffic types and options: • Service Demand and Throughput were measured with: Transmit (xmit) or bidirectional (bd) with TSO off compared to transmit or bidirectional with TSO on. • Transmit and bidirectional tests were run using netperf with a socket size of 128K bytes and a message size of 32K bytes. The results of TSO testing on single port Gigabit Ethernet cards A6825A (Base-T)/A6847A (Base-SX) are also described later in this article though not shown in graphs. For further discussion of the results obtainable with GigE cards other than the 2-port GigE cards, please refer to the section in this paper called "Technology Combinations to Use or to Be Aware Of." 5

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rp4440 Performance with GigE and TSO
5
rp4440 Performance with GigE and TSO
Efficiency of the HP rp4440 server with TSO over PCI-X 2-port Gigabit Ethernet A7011A
and A7012A cards is best demonstrated through tests that show:
•
Service Demand
. Service demand is the amount of time (in microseconds) it takes
one CPU to handle one kilobyte of data. It’s a straightforward measurement because it
eliminates disparities if comparisons are made with different quantities, types, or
frequencies of CPUs. Service Demand is an important capacity planning & performance
metric that is sometimes considered a better metric than CPU Utilization when
comparing different server models.
•
Throughput
. Throughput is the measure of the available bandwidth; in this article, it is
shown for one-way transmission alone as well as the combination of transmit and
receive throughput, also called bidirectional. It’s an important metric of networking
performance and server capacity sizing for optimal application performance. These
measurements can help determine how well one or a series of batch programs will run
with a certain workload or how many user requests can be handled.
The performance gains in service demand and throughput shown in this article were
measured with the
netperf
benchmarking software. The following charts show the overall
performance of one, two, and four ports on up to 2 PCI-X 2-Port Gigabit Ethernet cards in a
4-way rp4440. TSO was measured with the following traffic types and options:
•
Service Demand and Throughput were measured with:
Transmit (xmit) or bidirectional (bd) with TSO off
compared to
transmit or bidirectional with TSO on.
•
Transmit and bidirectional tests were run using
netperf
with a socket size of 128K
bytes and a message size of 32K bytes.
The results of TSO testing on single port Gigabit Ethernet cards A6825A (Base-T)/A6847A
(Base-SX) are also described later in this article though not shown in graphs. For further
discussion of the results obtainable with GigE cards other than the 2-port GigE cards, please
refer to the section in this paper called “Technology Combinations to Use or to Be Aware
Of
.”