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November 2011

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Subject:
SL6.1 slowdown due to polling
From:
Gerhard Schneider <[log in to unmask]>
Reply To:
Gerhard Schneider <[log in to unmask]>
Date:
Mon, 21 Nov 2011 10:55:22 +0100
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SL6.1, newest kernel+all fixes

For some months we discover a slowdown of selected machines ever 80-90
machines. There is high CPU load and the machine is getting less
responsive for a few seconds up to one or two minutes. No process are
running on high load - only CPU load in atop is high.

Affected machines are Core I7 on ASUS P6T and Core2 Duo on ASUS P5K.

After checking a hundred of things we isolated the problem to the
polling of a DVD drive and polling of USB card readers.

When disabling the polling in HAL and UDEV the problems disappear.
But in my understanding the polling is done every 2 seconds - can there
be a race condition every 80-90 minutes?

Any idea?
Thank you in advance!

Gerhard Schneider

-- 
Gerhard Schneider                            e-Mail:[log in to unmask]
Institute of Lightweight Design and          Tel.:   +43 1 58801 31716
Structural Biomechanics (E317)               Fax.:   +43 1 58801 31799
Vienna University of Technology / Austria    DVR: 0005886
A-1040 Wien, Gusshausstrasse 27-29         http://www.ilsb.tuwien.ac.at/

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