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Date: Wed, 24 Aug 2011 11:01:03 +0200
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Subject: Re: slow performance on disk/network i/o full speed after drop_caches
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>> sync&&  echo 3>/proc/sys/vm/drop_caches&&  sleep 2&&  echo 0
>>> /proc/sys/vm/drop_caches

Another way to get it working again is to stop some processes. Could be 
mysql or apache or php fcgi doesn't matter. Just free some memory. 
Although there are already 5GB free.

Stefan