Networking How much can you improve network throughput with a high-end NIC ?
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| How much can you improve network throughput with a high-end NIC ? |
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| Articles - Networking | |||||
| Written by prabhat sandy | |||||
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The non-motherboard NICS are two Intel Pro/1000 PT gigabit PCIe NICs. Unless otherwise specified, I performed my tests with a DLink DGS-1008D gigabit switch between the two computers. Apart from the two machines being tested, the switch was not under additional load. I performed some Intel NIC tests without the switch; latency was about 10-20% better without the switch but bandwidth was similar. I performed benchmarks using the lmbench (version 3.0-a9), fio (version 1.18) and bonnie++ (1.03) tools. lmbench provides many micro benchmarks; the most interesting for networks are bw_tcp, which measures network bandwidth, and the lat_tcp and lat_udp, which measure network latency for TCP and UDP communications respectively. I used fio and bonnie++ to measure performance when accessing a filesystem that is stored on a RAID-5 which is shared using NFS. I used fio mainly to see what difference the change of NICs makes to some typical filesystem access patterns on an NFS share.
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Nishant Kashyap
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... throughput for sequential read/write operations didn't improve much, but latency was much better, allowing anything that needs a network round trip, like create, delete, and seek, to work much faster. for which one ? onboard or the other |
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What sort of impact can you expect from switching a machine from the Gigabit Ethernet NIC that come on its motherboard to a higher-end Intel desktop NIC? I benchmarked two common gigabit NICs found on motherboards against two Intel PCIe desktop gigabit NICs, targeting the specific purpose of accessing an NFS share over the network. The short version: throughput for sequential read/write operations didn't improve much, but latency was much better, allowing anything that needs a network round trip, like create, delete, and seek, to work much faster.
