Andrew Pantyukhin wrote: > On 1/26/07, Stefan Ehmann <shoesoft_at_gmx.net> wrote: >> On Friday 26 January 2007 03:24, M. Warner Losh wrote: >> > On a lark, I just got a combo USB/Firewire external disk drive. I ran >> > some crude benchmarks, and I was surprised by what I found. This is >> > on a fairly stock -current kernel. >> > >> > Firewire does around 40MB/s, while USB 2.0 maxes out at about 12MB/s. >> > This is with a simple dd command: >> >> On my i386 notebook with USB 2.0 enclosure. >> Linux: 31.5MB/s >> FreeBSD: 27.5MB/s >> >> There's still room for improvement but numbers don't seem that bad. >> >> Maybe you should try knoppix or so to verify it's not the drive's >> fault. Other >> than that I'd also guess it's an amd64 problem. > > IIRC I got around 50Mb/s with most USB2.0 enclosures (and > drives capable of sustaining the speed) under Windows. As long as I know, FreeBSD USB stack doesn't support bulk transfers that are necessary to get a good speed of an USB drive. -MaximReceived on Fri Jan 26 2007 - 15:42:03 UTC
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