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XenServer's VM density testing uncovered a regression when moving from sysvinit to systemd where the file descriptor limit dropped from 4096 to 1024. (XenServer had previously inserted a ulimit statement into its initscripts.) One solution is to use LimitNOFILE=4096 in xenconsoled.service to match the lost ulimit, but that is only a stopgap solution. As Xenconsoled genuinely needs a large number of file descriptors if a large number of domains are running, attempt to increase the limit. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Ian Jackson <Ian.Jackson@eu.citrix.com>