Re: Sarge with ext3, reiserfs (3/4?) or xfs?

[Henrique de Moraes Holschuh <hmh@debian.org>]

On Wed, 09 Feb 2005, Ron Johnson wrote:
> On Wed, 2005-02-09 at 07:26 -0200, Henrique de Moraes Holschuh wrote:
> > On Tue, 08 Feb 2005, Ron Johnson wrote:
> > > > > >                                     and there is USB2 which is 
> > > > > > good enough and nearly always supported.
> > > > > 
> > > > > USB2 is much slower than firewire, and if a slow device is plugged
> > > > 
> > > > So what, if it is fast enough?  I do not need a 1GB/s (or 2GB/s, I forget)
> > > > channel to connect a single 320Mbit/s device.
> > > 
> > > ????????????
> > 
> > Firewire is either 1GB/s or 2GB/s I think.  A typical HD is about 320Mbit/s
> > sustained, even if it can get a bit better during bursts.
> 
> Plain old firewire (IEEE 1394-1995 & IEEE 1394a-2000) is 400Mbps.
> The newer IEEE 1394b is 800Mbps.

I stand corrected.  BTW, I did mean gigabits per second.

> > > I myself tested an external HDD that had both firewire & USB2
> > > jacks.  And then I attached the drive to the IDE chain.
> > > 
> > > Internally, the drive got 55MB/s
> > > With firewire, the drive got 30MB/s
> > > With USB2, it got 12MB/s.
> > 
> > This is USB1.1, not USB2.  Something in your chain did not get validated as
> > USB2.
> 
> Incorrect.
> 
> The maximum Utopian "Full speed" USB is 12 Mbps (1.5MBps).

Ah, bytes per second versus bits per second again.  I did mean bits per
second.  Sorry.

> Thus, when I got 12MB/s (96Mbps) effective throughput, it had to
> be using high-speed USB2.

Yes.

> The 96Mbps speed that USB2 reached on my system is only 20% of it's
> theoretical maximum.

It is higly interesting that it is 12Mbyte/s, though.  Might be chipset
weirdness, or device weirdness.  I need to read more on USB2 and how it
throttles speed (if it does).

> What USB has going for it is that it is *cheap*.

Indeed it is cheap.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh