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Re: kern/49186

The following reply was made to PR kern/49186; it has been noted by GNATS.

From: Tom Ivar Helbekkmo <>
Subject: Re: kern/49186
Date: Tue, 09 Sep 2014 19:14:36 +0200

 I have been advised that I ought to add the following data to this bug
 My system is giving me occasional "No buffer space available" messages.
 While it is mostly quiescent, these are from openvpn, and I've accepted
 that as being caused by a fast local net and a slow uplink over which
 the UDP based openvpn runs.  When I load down the system with more work,
 these messages get more frequent, and are joined by error messages from
 other subsystems, in particular dhcpd, which fails to respond to client
 packets, saying "send_packet: No buffer space available".  The location
 of the error is quoted in the console messages as dhcp.c:1561 and 3556.
 (Those are just the two on my console terminal right now; there may well
 be more.)  Note that this happens whether the RAID write-back cache is
 enabled or not; the change is that when the cache is enabled, I get the
 long network hangs (not with every mbuf allocation failure by far, but
 quite often), and with the cache disabled, I don't get noticable hangs.
 It doesn't matter how beautiful your theory is, it doesn't matter how smart
 you are. If it doesn't agree with experiment, it's wrong.  -Richard Feynman

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