Hi, I tried "netstat -su" and it showed me many UDP send buffer errors. So I tried to set "net.core.wmem_max" to 8388608 (8m). It did not help.
I googled a bit and found some network tuning guides for linux. I ended up with the following sysctl.conf: """ net.core.rmem_max=8388608 net.core.wmem_max=8388608 net.core.rmem_default=262144 net.core.wmem_default=262144 net.ipv4.udp_mem=8388608 12582912 16777216 net.ipv4.udp_rmem_min=16384 net.ipv4.udp_wmem_min=16384 """ This solved the problem and I do net get any of those log messages (and unexpected timeouts) anymore. One last question: If I use "so-rcvbuf: 8m" in unbound.conf does this only set the appropiate kernel variables (like I did with sysctl) or is the value "8m" used in some calculations inside unbounds code, too? Thank you for your help... Best regards, Sebastian Am Dienstag, den 09.11.2010, 17:14 +0100 schrieb W.C.A. Wijngaards: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi Sebastian, > > On 11/09/2010 04:51 PM, Sebastian Nickel - Hetzner Online AG wrote: > > Hello, > > I tried to increase so-rcvbuf to 8m and to 16m. I changed > > net.core.rmem_max values in system, too. > > > > I still see many of those lines in the log: > > Usually EAGAIN means the device is busy, but I have never seen it happen > on send. Attached a small patch, could you test this? It sets > SO_SNDBUF to the same value as SO_RCVBUF, perhaps the output buffer is full? > > If it gives permission denied, change SO_SNDBUF into SO_SNDBUFFORCE > > Otherwise, netstat -su? does it report send buffer overruns (or can it > possibly do so?). > > Does a symmetric rcvbuf-sndbuf setting make sense (apart from this > test)? Or do you need to be able to configure the sndbuf? (question > only applicable if attachment solves problem :-) ). > > Best regards, > Wouter > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.11 (GNU/Linux) > Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ > > iEYEARECAAYFAkzZc1UACgkQkDLqNwOhpPgvxwCeK+HBCVmX+xtSHXkc4SISq+1c > dXMAoJJMoVg9l2ILsRUdvQSTLNnOb4yR > =mpmH > -----END PGP SIGNATURE----- _______________________________________________ Unbound-users mailing list [email protected] http://unbound.nlnetlabs.nl/mailman/listinfo/unbound-users
