PCMCIA GigE adapters with jumbo frames
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Posted by Scott W Gifford on February 14, 2006, 2:46 pm
Please log in for more thread options Hello, I'm looking for a good PCMCIA GigE adapter with support for full-duplex operations (most seem to have this) and jumbo frames. None of the ones I looked at say whether they support them or not. Anybody have any recommendations? The application is copying large (multi-GB) video files over a LAN, which should be the sort of application where GigE and jumbo frames could make a difference. Thanks! ----Scott. | |||||||||||||||||||
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Posted by Rick Jones on February 14, 2006, 5:20 pm
Please log in for more thread options > Anybody have any recommendations?
> The application is copying large (multi-GB) video files over a LAN,
> which should be the sort of application where GigE and jumbo frames > could make a difference. So long as all the other nodes in the broadcast domain, and the switches connecting them, support Jumbo Frames. Is PCMCIA/Cardbus/whatever it is called even fast enough to make the CPU savings from JumboFrames interesting? rick jones -- oxymoron n, commuter in a gas-guzzling luxury SUV with an American flag these opinions are mine, all mine; HP might not want them anyway... :) feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... | |||||||||||||||||||
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Posted by Scott W Gifford on February 15, 2006, 11:12 am
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>> I'm looking for a good PCMCIA GigE adapter with support for
>> full-duplex operations (most seem to have this) and jumbo frames. >> None of the ones I looked at say whether they support them or not. >
>> Anybody have any recommendations?
>
>> The application is copying large (multi-GB) video files over a LAN,
>> which should be the sort of application where GigE and jumbo frames >> could make a difference. >
> So long as all the other nodes in the broadcast domain, and the > switches connecting them, support Jumbo Frames. They will be talking through a switch with jumbo frames to a server with jumbo frames; is that close enough? > Is PCMCIA/Cardbus/whatever it is called even fast enough to make the
> CPU savings from JumboFrames interesting? I believe the maximum theoretical bandwidth of PCMCIA Type II is 1056Mbps (33000 Hz x 32 bits), so the bus itself should be fast enough to support full GigE speeds. Thanks, ----Scott. | |||||||||||||||||||
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Posted by Rick Jones on February 15, 2006, 2:02 pm
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> They will be talking through a switch with jumbo frames to a server
> with jumbo frames; is that close enough? So long as the switch's definiton of "jumbo frame" matches that of the NICs on either end. There are some switches out there where "jumbo frame" is not defined as a 9000 byte MTU. >> Is PCMCIA/Cardbus/whatever it is called even fast enough to make the
>> CPU savings from JumboFrames interesting? > I believe the maximum theoretical bandwidth of PCMCIA Type II is
> 1056Mbps (33000 Hz x 32 bits), so the bus itself should be fast > enough to support full GigE speeds. Weelll, that would imply one can run a bus at 1000/1056 or ~95% utilization. One is doing really well (in broad handwaving terms) getting an I/O bus to 80% utilization, and lower than 80% may not be all that surprising. And that math above does not include stuff like DMA setup latency, bus turn-around events etc etc. So I'd be very pleasantly surprised to see link-rate from a PCMCIA GigE NIC. So, what is the CPU util and throughput you are seeing with the PCMCIA cards you've used thusfar? rick jones -- The computing industry isn't as much a game of "Follow The Leader" as it is one of "Ring Around the Rosy" or perhaps "Duck Duck Goose." - Rick Jones these opinions are mine, all mine; HP might not want them anyway... :) feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... | |||||||||||||||||||
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Posted by Scott W Gifford on February 15, 2006, 4:43 pm
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>> They will be talking through a switch with jumbo frames to a server
>> with jumbo frames; is that close enough? >
> So long as the switch's definiton of "jumbo frame" matches that of the > NICs on either end. There are some switches out there where "jumbo > frame" is not defined as a 9000 byte MTU. Ah, thanks for the heads up on that; the particular switch I'm looking at says in its docs it supports 9K MTUs. >>> Is PCMCIA/Cardbus/whatever it is called even fast enough to make the
>>> CPU savings from JumboFrames interesting? >
>> I believe the maximum theoretical bandwidth of PCMCIA Type II is
[...]
>> 1056Mbps (33000 Hz x 32 bits), so the bus itself should be fast >> enough to support full GigE speeds. > I'd be very pleasantly surprised to see link-rate from a PCMCIA GigE
> NIC. Oh, me too, but it's not so far off that it's not worth trying to squeeze out some extra performance. > So, what is the CPU util and throughput you are seeing with the
> PCMCIA cards you've used thusfar? There is no network yet; I'm giving general advice to somebody building a new SOHO-sized GigE network. I'm primarily a Unix server guy, so I'm kind of winging it in the network department. :-) From what I saw looking around, it looked like the extra cost to support jumbo frames was quite small for other devices (such as switches and PCI cards), and numerous benchmarks showed a performance and CPU utilization improvement. So, it seems sensible to buy a PCMCIA card with jumbo frame support, as long as one is available and the cost isn't too high. We can experiment afterwards to see if it makes a difference or not. On the other hand, if the cards aren't available or are very expensive, we can certainly live without it. I didn't have any luck finding these cards searching the Internet, and I was hoping somebody here happened to have one and could tell me the brand and whether it was any good. Thanks, ----Scott. | |||||||||||||||||||
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> full-duplex operations (most seem to have this) and jumbo frames.
> None of the ones I looked at say whether they support them or not.