linux-ext4 - Re: dump ext4 performance degrades linearly as disk fills

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Message-ID: <53D80A3F.5010807@ubuntu.com>
Date:	Tue, 29 Jul 2014 16:55:27 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	"Joseph D. Wagner" <joe@...ephdwagner.info>
CC:	linux-ext4@...r.kernel.org
Subject: Re: dump ext4 performance degrades linearly as disk fills

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On 6/19/2014 2:42 PM, Joseph D. Wagner wrote:
> Hello Theo.
> 
> I know you're working-for-free and have other things to do besides 
> work on my low priority problem.  However, I haven't heard from
> you. I just wanted to follow-up and make sure you got my
> attachment, not that anything fell through the cracks so-to-speak.

Just thought I'd suggest two things you might try:

1)  dump to /dev/null to make sure it is a read problem, and not a
problem writing the output file.

2)  You might try throwing e2defrag at the fs and see if that helps (
after a full backup of course ).  In the past I have seen significant
slowness when dumping due to my Maildir being fragmented all to hell.
 If you have any sets of large numbers of relatively small files, that
could be what you are seeing.  An e2defrag pass will completely clear
this up.

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