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datarate problems

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eng530   02-15-2005 at 03:31:41 PM

I am attempting to transmit a 42 MB/s digital video stream from a Firewire camera over a dedicated point to point gigabit Ethernet connection.

We are currently just testing the point to point connection and are having problems generating enough throughput with the gigabit Ethernet connection.

Si-soft Sandra benchmarks indicate that 50 MB/s is achievable with our connection (cat 6 cable, jumbo packets, flow control on).

However we have been physically testing the link by transferring a large (1.5 GB) file and can only achieve approx 20 MB/s (25 - simplex and 20 / 12 duplex).

At present we have a 2800XP (shuttle) connected to a 2.4GHz Celeron, both with D-link DGE 530T Gigabit Ethernet cards and SATA raid 0 Hard drives.

At present the system is operating on the PCI bus (33 MHz x 32 bit I think???) and I know PCIe will allow higher data rates, but we require a compact motherboard and I have not found a compact PCIe (I also want to understand a bit more regarding the bottleneck we are encountering in the PCI setup)

Cheers

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Dev   02-16-2005 at 01:15:34 PM
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What you are seeing is just a little less than standard GBoE performance. The truth is that the performance of GBoE (Cat 6) is maxed around 350Mb/s (at max 8 meters or ~24 feet), so you are getting around 60% of theoretical limit. So if your cable length is longer or you have some interference you will get around those speeds.

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