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--- linux:ubuntu [2009/05/25 00:35]
127.0.0.1 external edit
+++ linux:ubuntu [2014/03/13 09:13]
zagi
@@ Line 3: / Line 3: @@
    # update-alternatives --config editor
+=== Disabling compcache in Ubuntu Jaunty (and Related Swap Errors) ===
+This bug can also be seen if you are seeing errors like these:
+<code>
+Mar 6 17:27:29 server kernel: [14438.135859] compcache: Error allocating memory for compressed page: 60594, size=4096
+Mar 6 17:27:29 server kernel: [14438.135871] Write-error on swap-device (254:0:484752)
+Mar 6 17:27:29 server kernel: [14438.136813] allocation failed: out of vmalloc space - use vmalloc= to increase size.
+Mar 6 17:27:29 server kernel: [14438.136824] compcache: Error allocating memory for compressed page: 60595, size=2093
+Mar 6 17:27:29 server kernel: [14438.136835] Write-error on swap-device (254:0:484760)
+Mar 6 17:27:29 server kernel: [14438.137088] allocation failed: out of vmalloc space - use vmalloc= to increase size.
+Mar 6 17:27:29 server kernel: [14438.137098] compcache: Error allocating memory for compressed page: 60596, size=4079
+Mar 6 17:27:29 server kernel: [14438.137108] Write-error on swap-device (254:0:484768)
+</code>
+You can also see it when you print swap information with the command swapon -s – if compcache is enabled, one of the swap entries will be “ramzswap”.
+To disable compcache completely, do this:
+   rm -f /usr/share/initramfs-tools/conf.d/compcache && update-initramfs -u
+The file compcache contains this line – which is what enables (and sizes) compcache:
+   COMPCACHE_SIZE="25%"
+=== Optimize Dnsmasq in NetworkManager ===
+create file
+/etc/NetworkManager/dnsmasq.d/dnsmasq.conf
+with this content:
+  all-servers
+  cache-size=10000
+  addn-hosts=/etc/hosts
+  neg-ttl=3600
+  local-ttl=3600
+  bogus-priv
+for /etc/hosts use [[:spam|Hosts adblocker]]