linux-kernel - Re: RFC - how to balance Dirty+Writeback in the face of slow writeback.

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Message-Id: <200608210947.03793.ak@suse.de>
Date:	Mon, 21 Aug 2006 09:47:03 +0200
From:	Andi Kleen <ak@...e.de>
To:	David Chinner <dgc@....com>
Cc:	Neil Brown <neilb@...e.de>, Jens Axboe <axboe@...e.de>,
	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: RFC - how to balance Dirty+Writeback in the face of slow  writeback.


> > Ouch.  
> > I suspect we are going to see more of this, as USB drive for backups
> > is probably a very attractive option for many.
> 
> I can't see how this would occur on a 2.6 kernel 

I still got the traces to prove it:
http://www.firstfloor.org/~andi/usb-loop-copy-stall-1

e.g. notice the lynx which is stuck in a m/atime update. It was stalling
for a quite long time.

> 
-Andi
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