Here's an entry from the archives where Alan (sort-of) suggests using rlm_sqlippool to fix the same problem you're having: http://lists.cistron.nl/pipermail/freeradius-users/2009-July/039544.html SQL does appear to have better performance/ With Regards Stefan -----Original Message----- From: freeradius-users-bounces+stefan.paetow=diamond.ac.uk@lists.freeradius.org [mailto:freeradius-users-bounces+stefan.paetow=diamond.ac.uk@lists.freeradius.org] On Behalf Of George Chelidze Sent: 30 April 2013 10:57 To: FreeRadius users mailing list Subject: rlm_ippool vs rlm_sqlippool Greetings, We use rlm_ippool for pool management. Each pool is configured with 16K addresses. About 10K are used in the peek time (per pool). I believe we have almost reached our IO capacity, because heavy IO operations like gzipping a 300M file cause freeradius to throw errors like: Error: Discarding duplicate request from client C port 65038 - ID: 109 due to unfinished request 34797335 Error: Discarding duplicate request from client C port 65035 - ID: 98 due to unfinished request 34797336 and a bit later: Error: WARNING: Unresponsive child for request 34797366, in component post-auth module ippool-A Error: WARNING: Unresponsive child for request 34797382, in component post-auth module ippool-A Will it make any sense to switch to rlm_sqlippool? Will it be less IO sensitive? I know it's worth a try, however any additional information would be helpful. Thank you in advance, -- George Chelidze - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html -- This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail. Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message. Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom