Date: Fri, 26 Jan 2007 08:41:22 -0800 From: Maxim Sobolev <sobomax@FreeBSD.org> To: Andrew Pantyukhin <infofarmer@FreeBSD.org> Cc: freebsd-current@FreeBSD.org, "M. Warner Losh" <imp@bsdimp.com>, Stefan Ehmann <shoesoft@gmx.net> Subject: Re: Interesting speed benchmarks Message-ID: <45BA2F32.1050806@FreeBSD.org> In-Reply-To: <cb5206420701260202p45046999kaec34a6876141728@mail.gmail.com> References: <20070125.192448.-432840241.imp@bsdimp.com> <200701261052.12435.shoesoft@gmx.net> <cb5206420701260202p45046999kaec34a6876141728@mail.gmail.com>
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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
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