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Re: [rdiff-backup-users] Severe performance degradation

From: Maarten J H van den Berg
Subject: Re: [rdiff-backup-users] Severe performance degradation
Date: Wed, 22 Dec 2010 15:02:36 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100816 Thunderbird/3.1.1

On 12/21/10 18:51, Jakob Unterwurzacher wrote:

> What about the kernel version? Probably barriers are now working as they
> should and you pay the price for that. dpkg package management had huge
> performance regressions due to this AFAIR.

Googled a bit on that but I'm left confused: are you talking about
memory barriers, ext4 barriers, or some other type ?

> Other than that, I'd try to find out where rdiff-backup is spending all
> the the time. What does
> iostat -dx 1
> in the %utils column say while an incremental is running?
> You could even fire up sysprof to see what it is waiting for.

We did monitor that a couple of weeks back. I do not have numbers
readily available now but we did not find a specific reason I believe.

For now I'm going to probably work around it by making the process a
two-phase one: first step rsync, second step rdiff-backup...
I may still do repaet tests with iostat later, if only to find out what
is causing this...


> Regards,
> Jakob
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