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| Thread ID: 96448 | 2009-01-10 23:09:00 | Gigabit and PCI | stormdragon (6013) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 737155 | 2009-01-11 02:02:00 | the problem with PCI bus is it very rarly runs at full speed. then also its shared with other cards and sometimes even onboard devices. with gigabit lan and raid cards you can flood the PCI and cause problems. |
tweak'e (69) | ||
| 737156 | 2009-01-11 04:01:00 | That said, gigabit LAN is 125MB/s (divide by 8 to get bytes) Peak transfer rate of PCI is 133MB/s or 266MB/s, however if the BUS is shared with other devices, it'll obviously affect speeds. (en.wikipedia.org ) That said, I chucked a gigabit PCI Lan card into my desktop and got pretty darn good speeds during some ad-hoc testing. Transferred 5GB in around 3 minutes :) Question is, for $20, do you really transfer that many large files to justify the outlay purchase of the LAN Card, as well as potentially cables and a gigabit switch? |
Chilling_Silence (9) | ||
| 737157 | 2009-01-11 23:36:00 | How are you calculating 1/4 speed?, you are correct in that hard` disc will also use the pci bus bandwidth but i dont follow your 25% step down?? I'm not sure where that 25% is coming from myself... That said, gigabit LAN is 125MB/s (divide by 8 to get bytes) Peak transfer rate of PCI is 133MB/s or 266MB/s, however if the BUS is shared with other devices, it'll obviously affect speeds. This is what I meant, 125MB/s (if you're lucky to begin with) will not use the entire bandwidth of the PCI bus... this is ignoring other data transfers through it. I find that my maximum throughput for my own LAN (this is on 100Mbit ethernet) is about 80% of the maximum it could be (should be 12.5MB/s, usually about 10MB/s peak, 8.5MB/s continuous) but then I have cheap switches :) Which is another thing you have to watch out for - the cheaper ones also distribute the entire bandwidth through the entire device, so full speed transfer can only be obtained when only 2 computers are copying data. (It's 100Mbit shared between all ports, not 100Mbit dedicated to each port) So for a 24-port switch to allow full 100Mbit speed through all ports concurrently it needs to have a 4.8Gbit "backbone" (for full duplex mode) |
Agent_24 (57) | ||
| 737158 | 2009-01-12 00:04:00 | I'm not sure where that 25% is coming from Ummm, general bites\bytes miscomprehenion 101!?...:blush: |
SolMiester (139) | ||
| 737159 | 2009-01-12 00:22:00 | Whats the SUSTAINED data throughput speed of the hard drives at both ends?? | sroby (11519) | ||
| 737160 | 2009-01-12 02:50:00 | HDD speeds are generally MUCH faster than that Grab the little app here, CHDDSPEED , and use it to test your HDDs transfer speeds :) www.benchmarkhq.ru |
Chilling_Silence (9) | ||
| 737161 | 2009-01-13 05:06:00 | Thanks for the feedback, think I might just leave it a while then upgrade the server to a dual core atom board with onboard gigabit lan. :thanks |
stormdragon (6013) | ||
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