-------- Forwarded Message --------
From: Karsten Suehring <suehringb...@gmail.com>
To: Ben Hutchings <b...@decadent.org.uk>
Subject: Re: Bug#692957: linux-image-3.2.0-4-amd64: NFS server causes high load
on 3.2 kernel
Date: Sun, 11 Nov 2012 22:58:11 +0100
I don't think load figures from a VM are likely to be
meaningful.
I agree for detailed measurements, I guess in order of magnitude it's
fine to draw some conclusions. Also it's the only way for me to run lots
of different test setups (especially being at home). I can do some more
measurements on a real system tomorrow.
That fix was backported into 3.2.29, so we have it already. Are
you
definitely running the above version (3.2.32-1) on the server?
I was running the bug report tool on the actual server VM and just
checked the version and performance numbers again.
root@debian-server:~# uname -a
Linux debian-server 3.2.0-4-amd64 #1 SMP Debian 3.2.32-1 x86_64
GNU/Linux
But it seems the patch had some positive effect, which I didn't notice
before. On the Ubuntu Server I see a constant load of 40%. On Debian I
have more an average around 25-30% with peaks going up to 40%, but also
peaks in the other direction going down below 10%.
But as I said before, it's not the same as if I boot the old 2.6 kernel
on the same machine:
root@debian-server:~# uname -a
Linux debian-server 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012
x86_64 GNU/Linux
With that kernel (an nothing else changed) the numbers go down to around
10%.
Thanks for looking into this,
Karsten
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