Is sysevent the right mechanism here? I think maybe not. Sent from my iPhone
> On Oct 8, 2013, at 8:01 PM, Robert Mustacchi <[email protected]> wrote: > >> On 10/8/13 18:22 , Alex Wilson wrote: >> Hi all, >> >> Currently in sysevent, the maximum number of subscribers to a channel is set >> to EVCH_MAX_SUBSCRIPTIONS, which is unchangeable at run time (except via mdb >> fiddling with a channel after it's been created). The value in illumos at >> the moment is 32, which seems very low, especially for system-wide channels >> like the zone status one. I was wondering if anybody knows of adverse >> impacts there might be by increasing this -- to 256 or 512 or so. Will this >> cause serious problems anywhere (beyond making posting events to channels >> that actually have that many subscriptions a bit slower)? >> >> For the background about why I'm asking this: I'm using Project FIFO's >> chunter on SmartOS, and chunter uses a library called libzdoor that Joyent >> provide for zone <-> global zone communication (specifically, it lets >> chunter decide centrally to approve/deny ssh logins with a public key). >> Libzdoor makes a subscription (indirectly) to the com.sun:zones:status >> channel for every zone you want to communicate with, so if I have >32 zones >> on one host, it starts dying with ENOMEM (the return value when you have >> exceeded the max subscribers limit) and even zoneadm and friends start >> playing up. > > In general, we could increase it, but having the global zone have one > listener on the sysevent per zone is a bad idea and definitely doesn't > scale. Increasing the number doesn't really solve the core problem that > you actually have. It's easy to imagine systems where you have more > zones than whatever new number you pick. What needs to be fixed is the > fact that it indirectly has one sysevent subscription per zone on the box. > > Robert > > > ------------------------------------------- > illumos-discuss > Archives: https://www.listbox.com/member/archive/182180/=now > RSS Feed: https://www.listbox.com/member/archive/rss/182180/22003744-9012f59c > Modify Your Subscription: https://www.listbox.com/member/?&; > Powered by Listbox: http://www.listbox.com ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
