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Massimo B.
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PostPosted: Mon May 22, 2006 6:50 pm    Post subject: Magic speed over USB 1.1 Reply with quote

This time rather good news:

As far as I know this iBook has USB 1.1.
I have an exxternal firewire drive (Minipod) connected with firewire and USB hub integrated.

And now I am wondering: Copying files from firewire hd to an USB stick I get averagely 3-4MB/s. That is more than twice 12 Mbit/s USB 1.1 speed. That's as fast as copying to the internal hd, so to say maximum speed just limited by the encryption performance.
I tried several times with data about 200 MB.

I even wonder I the data wouldn't go over the iBook. But the firewire drive is encrypted and has to go over the G3 cpu and USB interface.
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chrismortimore
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PostPosted: Mon May 22, 2006 8:00 pm    Post subject: Reply with quote

You'll probably find that the data is getting copied into a bugger, and written slowly at a later time. My flash drive is USB1.1, I copy stuff over and it goes "instantly" (or near as damnit). If I unmount the stick, it waits until all of the data in the buffer has finished writing before it unmounts. Maybe you have something similar going on.
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alphonce
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PostPosted: Mon May 22, 2006 8:05 pm    Post subject: Reply with quote

according to http://www.everythingusb.com USB 1.1 has a top speed of 12 Mbps.
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PostPosted: Tue May 23, 2006 12:55 pm    Post subject: Reply with quote

alphonce wrote:
according to http://www.everythingusb.com USB 1.1 has a top speed of 12 Mbps.
Exactly. 12Mbps/8=1.5MBps. Note b=bit and B=byte.
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alphonce
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PostPosted: Tue May 23, 2006 1:00 pm    Post subject: Reply with quote

chrismortimore wrote:
alphonce wrote:
according to http://www.everythingusb.com USB 1.1 has a top speed of 12 Mbps.
Exactly. 12Mbps/8=1.5MBps. Note b=bit and B=byte.


ok, I just presumed Mbps meant Megabyte per second, since the use the term Mbits/second also.
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chrismortimore
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PostPosted: Tue May 23, 2006 1:14 pm    Post subject: Reply with quote

alphonce wrote:
ok, I just presumed Mbps meant Megabyte per second, since the use the term Mbits/second also.
Its a common mistake, people are too sloppy with their terminology these days. Also doesn't help that the latest trend is to drop capital letters, so people end up talking about mbps (milli-bits per second)...</RANT>
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Massimo B.
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PostPosted: Tue May 23, 2006 2:58 pm    Post subject: Reply with quote

Therefore I said 3MBps should be twice as 12Mbps.
Ok, should be something about caching. But also umount didn't take long.
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PostPosted: Tue May 23, 2006 5:11 pm    Post subject: Reply with quote

paoleela wrote:
Ok, should be something about caching. But also umount didn't take long.
Do you copy loads (like 100MB+) and umount straight away or leave it for a while? I put 300MB of vids onto an SD card through a USB 1.1 card reader today, and it buffered everything and the write LED on the card reader blinked for the next 5 minutes (or so) as it actually wrote stuff. During that time, I issued a umount command and stared at the blinking LED till it stopped..

Anyway, if it works at twice the speed, keep quiet or it might get embarrased and slow down ;)
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Massimo B.
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PostPosted: Tue May 23, 2006 5:57 pm    Post subject: Reply with quote

chrismortimore wrote:
Anyway, if it works at twice the speed, keep quiet or it might get embarrased and slow down ;)
Yeah, maybe a Suse user wouldn't start a topic about somethings working better than predicted. :)just kidding..
Gentoo users just want to understand and control.
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