Solarflare onload adapters | ||||||
| posted by Brian Krusic on Nov. 15, 2013, 5 p.m. (3 days ago) | ||||||
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| Thread Tags: discuss-at-studiosysadmins | ||||||
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| Any one use these bad boys? Lotta hype. Seem like some TCP offload/etc... good-ness. I'm using the regular Solars. Thing is its all PCIe Gen 2. Calomel had a most fascinating write up on Gen2 vs Gen3. Key points pasted below; We highly recommend getting an interface card supporting PCIe due to
their high bandwidth and low power usage. Note, PCIe version 2.x has a
20% bandwidth overhead which PCIe version 3.x does not. PCIe 2.0
delivers 5 GT/s (GT/s is Gigatransfers per second), but employs an
8b/10b encoding scheme which results in a 20 percent overhead on the raw
bit rate. PCIe 3.0 removes the requirement for encoding and uses a
technique called "scrambling" in which "a known binary polynomial" is
applied to a data stream in a feedback topology. Because the scrambling
polynomial is known, the data can be recovered by running it through a
feedback topology using the inverse polynomial and also uses a 128b/130b
encoding scheme, reducing the overhead to approximately 1.5%, as
opposed to the 20% overhead of 8b/10b encoding used by PCIe 2.0. The actual article; Thoughts? - Brian SoCals #1 Sandpaper Superstore. More Grit For Less Green. |