Re: [gentoo-user] Re: [OT] Disappointing USB3 performance

2011-10-24 Thread Florian Philipp
Am 24.10.2011 22:02, schrieb Grant Edwards: On 2011-10-24, walt w41...@gmail.com wrote: I just bought an add-on USB3 adapter and outboard USB3/sata docking station, and I've been comparing the performance with my old e-sata outboard docking station. Not so good :( After getting some

Re: [gentoo-user] Re: [OT] Disappointing USB3 performance

2011-10-24 Thread Paul Hartman
On Mon, Oct 24, 2011 at 4:31 PM, Grant Edwards grant.b.edwa...@gmail.com wrote: On 2011-10-24, Florian Philipp li...@binarywings.net wrote: Am 24.10.2011 22:02, schrieb Grant Edwards: On 2011-10-24, walt w41...@gmail.com wrote: I just bought an add-on USB3 adapter and outboard USB3/sata

Re: [gentoo-user] Re: [OT] Disappointing USB3 performance

2011-10-24 Thread Michael Mol
On Oct 24, 2011 7:21 PM, walt w41...@gmail.com wrote: On 10/24/2011 10:28 AM, walt wrote: ... Over at least six trials on each docking station I consistently get 105 seconds for USB and 84 seconds for e-sata, a 5:4 ratio in favor of e-sata/sata over USB3/sata... Wow, lots of great

Re: [gentoo-user] Re: [OT] Disappointing USB3 performance

2011-10-24 Thread Allan Gottlieb
On Mon, Oct 24 2011, Michael Mol wrote: On Oct 24, 2011 7:21 PM, walt w41...@gmail.com wrote: Now, lack of DMA is another story for hard disks, certainly. Here's where my ignorance of hardware limits my thinking: AFAIK the device driver *always* sits between the disk drive and the DMA

Re: [gentoo-user] Re: [OT] Disappointing USB3 performance

2011-10-24 Thread Adam Carter
USB does use DMA. Check the kernel source doco Documentation/usb/dma.txt