Subject: Re: Extremely poor umass transfer rates
From: Mark Rosenstand <mark@ossholes.org>
To: Paulo Marques <pmarques@grupopie.com>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <4271292F.1000002@grupopie.com>
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	 <1114710941.8326.13.camel@mjollnir.bootless.dk>
	 <20050428110614.00a0c193.rddunlap@osdl.org> <4271292F.1000002@grupopie.com>
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Date: Thu, 28 Apr 2005 20:47:12 +0200
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On Thu, 2005-04-28 at 19:19 +0100, Paulo Marques wrote:
> > | The line that 'hald' puts in fstab looks like this:
> > | 
> > | 	/dev/sdb /media/usbdisk vfat \
> > | 		user,exec,noauto,utf8,noatime,sync,managed 0 0
> 
> The "sync" flag is what is killing your performance. It is needed if you 
> intend to remove your usb pen without warning, but if you are going to 
> unmount carefully you don't need it at all.
> 
> Try mounting the device as root somewhere else without the "sync" flag 
> and measure the performance that way, to see the difference.

Wow. That seems to speed things up alot. However I can't unmount it
again, I keep getting "umount: /media/usbdisk: device is
busy" (twice(?)). It's been 5 minutes since I did the transfer (4 MB
file) now.

> I hope this helps,

It sure did. Thanks!

-- 
  .-.    Mark Rosenstand        (-.)
  oo|                           cc )
 /`'\    (+45) 255 31337      3-n-(
(\_;/)   mark@geekworld.org    _(|/`->

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