[rescue] Gigabit Ethernet SBus & Gigabit Ethernet Sun 420R/220R
alaric at metrocast.net
Sun Apr 6 09:46:07 CDT 2008
Steve Sandau wrote:
> Tom "spot" Callaway wrote:
>> On Sat, 2008-04-05 at 23:37 -0400, Joshua Boyd wrote:
>>> On Apr 5, 2008, at 11:27 PM, Tom "spot" Callaway wrote:
>>>> On Sat, 2008-04-05 at 23:03 -0400, Earl D. Baugh Jr. wrote:
>>>>> Two Gigabit ethernet questions....
>>>>> Did anybody ever make a Gigabit ethernet SBus card that ran across
>>>>> twisted pair?
>>>> Wouldn't that be a bit silly, since SBUS maxes out at 200 MB/s (64 bit
>>>> bus)? Or is it bridging to PCI to get around that somehow?
>>> So, basically, you are pointing out that SBUS can do about 2.5 times
>>> the bandwidth that one would realistically get from GigE? Why is
>>> that silly then?
>> Ehh, I suppose. I was thinking 1000 MB/s, but that's not realistic.
> I would hope that gigE would max out at more like 500MB/s, but I have
> not worked with gigE and jumbo frames enough to know.
> 100MB ethernet maxes out at what, 70MB/s or 80MB/s under ideal
> conditions, or is that even too optimistic?
It's megabits, remember, not megabytes.
I have gotten an honest 97Mbit/s data rate across my local 100Mbit
network. That's about 12 MB/s. If GigE can manage 900Mbit/s actual
throughput, that's 112MB/s. So if SBUS tops out at 200MB/s, it should
take GigE traffic just fine. If that's 200Mbit/s, then GigE on SBUS
isn't going to work too well. :)
Phil Stracchino, CDK#2 DoD#299792458 ICBM: 43.5607, -71.355
alaric at caerllewys.net alaric at metrocast.net phil at co.ordinate.org
Renaissance Man, Unix ronin, Perl hacker, Free Stater
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