Il 18/04/2014 23:43, Matthew Madey ha scritto:
Looking to get some feedback on performance settings any of you may
have done on your Spacewalk server and\or external Oracle Database
servers.
I'm looking to patch 1600 systems simultaneously to meet our business
requirements.. at our current settings with an 8 CPU \ 32 GB RAM
Spacewalk server, I can patch 400 systems simultaneously without much
issue. Much of our bottleneck appears to be disk await time on the
Oracle database side, which we are addressing, but I'm wondering if
there are other kernel\tomcat\apache settings I should be looking at
to improve handling of all the XMLRPC traffic coming in to the
Spacewalk server.
400 systems appears to be our hard limit at the moment, adding just an
additional 50 or so leads to some pretty catastrophic effects. I
haven't seen any GC or JVM errors in catalina.out thus far, but our
memory usage goes through the roof and begin swapping badly. My guess
is that the wait time on the database is so bad the Spacewalk server
starts backlogging requests until it runs out of memory.
Has anyone else attempted to patch this volume of systems at one time?
If so, what changes did you make to the server configuration to
accommodate that?
Below are some of the network tuning parameters we've entered.
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_syncookies = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.secure_redirects = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.neigh.default.unres_qlen = 3
#Added OSE Tuning
###8x normal for faster network queue draining
net.core.dev_weight = 512
#
###3x normal for a queue and budget suited to networks greater than
100mbps
net.core.netdev_budget = 10000
net.core.netdev_max_backlog = 30000
net.core.rmem_max = 4194304
net.core.wmem_max = 1048586
####min, default (BDP), max (2xBDP) for window scaling (BDP calculated
for 10gbps link speed and near zero latency in a LAN)
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 163844194304
####Affects UDP streams similarly to the above for TCP.
net.core.rmem_default = 312500
net.core.wmem_default = 312500
###Enable Packetization Layer Path MTU Discovery (PLPMTUD)
net.ipv4.tcp_mtu_probing = 1
net.core.somaxconn = 1536
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hello Matthew,
never tried your workloads... but simple question: have you tried to
disable https for http?
best regards
a
--
Amedeo Salvati
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