linux-kernel - Re: Houston, we have a problem: big file copying, USB, external disks

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Date:	Mon, 18 May 2009 14:08:14 +0200
From:	Ralf Hildebrandt <Ralf.Hildebrandt@...rite.de>
To:	linux-kernel@...r.kernel.org
Subject: Re: Houston, we have a problem: big file copying, USB, external
	disks

* John Zupfel <jzupfel@...oo.co.uk>:
> 
> Are recent kernels (since somewhere around 2.6.27 - 2.6.28)
> choking on big file copying?
> 
> 
> https://bugs.launchpad.net/ubuntu/+source/gvfs/+bug/197762?comments=all

Does this happen AFTER a suspend/hibernate or ALL THE TIME?

> > No, it's not Ubuntu specific and Canonical didn't cause it.
> > 
> > Right now I'm copying between two SATA drives, connected to my PC via
> > eSATA.  So far a lousy 600MB has been copied and I'm already down to
> > 5MB/s and falling.
> > 
> > Here is what I know about the problem:
> > 
> > It affects ALL hardware.
> > 
> > It affects ALL file copying connections to varying degrees: USB,
> > network, SATA/eSATA.
> > 
> > In some instances, it also affects multitasking, all but locking the
> > computer up despite little to no CPU use in System Monitor.
> > 
> > There are no error logs, messages or anything else that occur when the
> > problem is happening.
> > 
> > In my experience, if you test for the problem and nothing seems to be
> > wrong, then that's because you aren't copying enough data, you don't
> > know how fast your hardware should be copying files, or you are lucky
> > enough to only be subtly affected that time.  Try copying more multi-
> > gigabytes of data, several times and see if you can't get wildly
> > different durations for the same data size.  As I state above, all
> > hardware I have tested is affected to varying degrees, some hardware
> > shows minor performance degradation over time, some hardware is all but
> > useless for file copying.
> > 
> > If you ask me, it's either the scheduler (GUI lockups with no CPU usage
> > makes me think this) or whatever performs the actual file copy process.
> > It's definitely not a USB problem because it affects network copying
> > too.
> 
> 
> 
>       
> --
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-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12200 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  Ralf.Hildebrandt@...rite.de | http://www.charite.de
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