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Date: Fri, 26 Jan 2007 08:41:22 -0800
From: Maxim Sobolev <sobomax@FreeBSD.org>
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To: Andrew Pantyukhin <infofarmer@FreeBSD.org>
References: <20070125.192448.-432840241.imp@bsdimp.com>	<200701261052.12435.shoesoft@gmx.net>
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Cc: freebsd-current@FreeBSD.org, "M. Warner Losh" <imp@bsdimp.com>,
	Stefan Ehmann <shoesoft@gmx.net>
Subject: Re: Interesting speed benchmarks
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Andrew Pantyukhin wrote:
> On 1/26/07, Stefan Ehmann <shoesoft@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.

-Maxim