Date: Thu, 22 Mar 2012 10:07:28 +0000 From: Traiano Welcome <Traiano.Welcome@mtnbusiness.co.za> To: Traiano Welcome <Traiano.Welcome@mtnbusiness.co.za>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: FreeBSD: syslog-ng: I/O error occurred while writing; fd='xx', error='No buffer space available (yy)' Message-ID: <CB90C645.DD68%traiano.welcome@mtnbusiness.co.za> In-Reply-To: <CB90C586.DD60%traiano.welcome@mtnbusiness.co.za>
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--_004_CB90C645DD68traianowelcomemtnbusinesscoza_ Content-Type: text/plain; charset="us-ascii" Content-ID: <38111E9CC6DD97428C284D5ED8E28AE1@int.mtnbusiness.net> Content-Transfer-Encoding: quoted-printable Performance graphs that were supposed to be attached in the last mail :p On 22/03/2012 12:03, "Traiano Welcome" <Traiano.Welcome@mtnbusiness.co.za> wrote: >Hi List > >I've been seeing the following in the messages log of my freebsd syslog >server for quite some time now: > >--- >Mar 20 12:19:12 syslog2 syslog-ng[35313]: I/O error occurred while >writing; fd=3D'12', error=3D'No buffer space available (55)' >Mar 20 12:19:12 syslog2 syslog-ng[35313]: Connection broken; >time_reopen=3D'60' >Mar 20 12:19:12 syslog2 syslog-ng[35313]: I/O error occurred while >writing; fd=3D'13', error=3D'No buffer space available (55)' >Mar 20 12:19:12 syslog2 syslog-ng[35313]: Connection broken; >time_reopen=3D'60' >--- > >These happen at a frequency of about 7 per minute on average. See attached >trend graphs for an idea of the volume of traffic we're doing, as well as >the memory and cpu utilisation trends on this server during this period. >As can be seen from the graphs, load does not seem to be the issue. >Occasionally during the week, the system freezes and requires a reboot, I >think it's related to the above message, though I'm not sure. > >My question is: What does this error mean, and how can I resolve it? > >I have tried to frame this as an operating system kernel resource issue, >and experimented with increasing the freebsd kernel sysctls for UDP >performance: > >--- >[root@syslog2 <mailto:root@syslog2.ops.mtnbusiness.co.za> /var/log]# >sysctl kern.ipc.nmbclusters=3D102400 >kern.ipc.nmbclusters: 25600 -> 102400 > >[root@syslog2 <mailto:root@syslog2.ops.mtnbusiness.co.za> /var/log]# >sysctl kern.ipc.maxsockbuf=3D201326592 >kern.ipc.maxsockbuf: 100663296 -> 201326592 > >[root@syslog2 <mailto:root@syslog2.ops.mtnbusiness.co.za> /var/log]# >sysctl net.inet.udp.recvspace=3D33554432 >net.inet.udp.recvspace: 16777216 -> 33554432 >--- > >This has reduced the frequency of the errors a little, but in general the >problem still remains. > >Syslog version: > >-- >[root@syslog2]# syslog-ng -V >syslog-ng 2.0.10 > >-- > >FreeBSD version: > >-- >FreeBSD 7.2-STABLE #0 >-- > >Any help would be much appreciated! >Traiano > > >_______________________________________________ >freebsd-net@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-net >To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" --_004_CB90C645DD68traianowelcomemtnbusinesscoza_--
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