[EMAIL PROTECTED] wrote: > I have the numbers if someone wants me to send them to look at. At the > moment, I'm at a loss as to why. Does everything go through the PCI bus? Is > the PCI bus a 33 Mb/sec bus? Are the speeds more pronounced with small > (bursts) files and less with overall throughput? Once again, would different > drivers make a significant difference. Of course, I'm now wondering about my > Trio card as well. Is it limiting the ATA and FW transfer speeds? > > I don't want to bore other listers, so if you want to e-mail me directly, and > discuss it deeper, that's ok. > STeve
Well, from what I can tell, you've managed a seriously complex and redundant test of your 50 MHz system bus, Steve ;-) Testing the ATA card would best be done by transferring files from a drive on one bus to a drive on the other, so the card handles the entire transfer, (transferring bwteen two partitioons of the same drive should be reasonably close, as well, though it might be faster.) Same for firewire. Also, Firewire connects at 400 mega*bits* per second, not mega*bytes* that's an eightfold difference right there. That means it's about 50 MB/sec. Also, *everyone* lies about their transfer speed./ Most devices do well with burst transfers where the data's alrready in the memory buffers. That's how they achieve their higest speeds, and is only rarely, if ever, achieved in real life. These are also measuring the speeds where the device or interface it self is the limiting factor. Since you're moving data between different devices on all your interfaces, you're measuring the speed of the common bottleneck...your system bus. :-/ -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
