Moving an HD from one comp to another

Lennart Sorensen lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Thu Nov 25 23:32:33 UTC 2010


On Thu, Nov 25, 2010 at 01:27:23PM -0500, William Muriithi wrote:
> Was very grateful to learn this when it was posted a while back.
> Explained why whenever I am offloading some data from the server to an
> USB drive, it always tend to trigger high load nagios alert.  Its even
> odd that USB 2 using polling instead on interrupts
> 
> That said, it looks like they have fixed both the lack of DMA and
> interrupts  with USB 3.  I have just scanned through USB 3
> specification and I wonder if I got this fact right

I would hope so.  I highly doubt they could pull off 4.8Gbit/s without
DMA.

For USB1 it was OK.  For USB2 it was a crappy design choice (Firewire
already had DMA done right which is why 400 and 800Mbit/s firewire works
great with very little CPU load).

-- 
Len Sorensen
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