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List:       opensuse-factory
Subject:    Re: [opensuse-factory] I/O Performance much lower with new 3.17 kernel?!?
From:       Manfred Hollstein <mhollstein () t-online ! de>
Date:       2014-12-11 9:40:13
Message-ID: 20141211094013.GA32742 () saturn ! hollstein ! homelinux ! org
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Hi there,

On Fri, 07 Nov 2014, 12:57:43 +0100, Manfred Hollstein wrote:
> On Fri, 07 Nov 2014, 12:15:15 +0100, Jan Engelhardt wrote:
> > On Monday 2014-11-03 15:27, Manfred Hollstein wrote:
> > >
> > >Before, a whole bunch of messages
> > >arrived on my workstation without any significant delay; now, running
> > >the same on kernel version 3.17.1-1.2.g5c4d099 looks like one e-mail per
> > >second. [...] I have now installed kernel version 3.16.7-1.gdfcb69e-desktop (from
> > >Kernel:/openSUSE-13.2/standard) and performance is back to normal. I
> > >don't know if this is a networking or a file system issue
> > 
> > That is somewhat easy to figure out - download files into tmpfs (e.g.
> > /dev/shm) and measure the two kernels.
> 
> yeah, in the meantime I almost narrowed it down to a fetchmail-only
> problem.  Everything else (local file system access, NFS access) appears
> to perform at very similar numbers, it's just fetchmail that is
> annoyingly slow...

I just tried the new 3.18.0-2.g2b473fc-desktop kernel from Kernel:HEAD
and the performance problems are gone. It looks like it's only a 3.17
problem. I'll put it into bugzilla.

Cheers.

l8er
manfred

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