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CA-101788: increase xenconsoled default number of fds in xenservices …

…from 1024 to 4096

xenconsoled is currently started in xenservices using the default ulimit -n
value 1024. This aligns well with the limit of 1024 fds that the xenconsoled
select() can handle. Each vm console will tipically use 3 fds (4 if logging
is enabled), limiting the number of consoles in dom0 to a couple of hundred.

The new upstream xenconsoled uses poll() instead of select() and can handle
>1024 fds, as long as its ulimit -n value is properly set up in xenservices.
Increasing this value to 4096 will allow us to have 1000 vm consoles in dom0,
which is more aligned to other values.

Signed-off-by: Marcus Granado <>
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Marcus Granado
Marcus Granado committed Mar 21, 2013
1 parent 282951f commit 4f5382d97528eb90dd65e21f761b65f8a089ab78
Showing with 3 additions and 0 deletions.
  1. +3 −0 scripts/init.d-xenservices
@@ -36,7 +36,10 @@ start() {
[ -e /var/lib/xenstored/tdb ] && mv -f /var/lib/xenstored/tdb /var/lib/xenstored/tdb.bak
"@BINDIR@/xenstored" ${XENSTORED_ARG}
+ OLD_ULIMIT_N=$(ulimit -n)
+ ulimit -n 4096
+ ulimit -n $OLD_ULIMIT_N
[ -d /var/log/blktap ] || mkdir /var/log/blktap
# Delete rubbish from xapi's private tree in xenstore, once per boot (not once per

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