cvs commit: src/sys/sys eventhandler.h src/sys/kern kern_descrip.c uipc_socket.c

Jeff Roberson jroberson at
Mon Mar 17 05:00:47 PDT 2008

On Sun, 16 Mar 2008, Maxim Sobolev wrote:

> Robert Watson wrote:
>> On Sun, 16 Mar 2008, Maxim Sobolev wrote:
>>> sobomax     2008-03-16 06:21:30 UTC
>>>  FreeBSD src repository
>>>  Modified files:
>>>    sys/sys              eventhandler.h
>>>    sys/kern             kern_descrip.c uipc_socket.c
>>>  Log:
>>>  Properly set size of the file_zone to match kern.maxfiles parameter.
>>>  Otherwise the parameter is no-op, since zone by default limits number
>>>  of descriptors to some 12K entries. Attempt to allocate more ends up
>>>  sleeping on zonelimit.
>> Hmm.  Could you be more specific about the nature of the problem you're 
>> seeing here?  UMA shouldn't impose any default zone limit on the file_zone 
>> if none is set.  Are you sure it's the struct file zonelimit you're running 
>> into, and not, say, the socket zone limit, etc?
> Yes, you are right, further investigation revealed that in my case I was 
> hitting maxsockets limit, not maxfiles limit. Not sure if the backout is in 
> order or having files zone limit has some value, so that possible leaks can 
> be detected and UMA zone can potentially do size-based optimizations in the 
> future?

The UMA max is complicated due to per-cpu caches.  Really the limit code 
in uma should be rewritten or all consumers should handle it themselves 
the way struct file does.  It'd probably be best if you backed this out.


>> Also, don't use SI_SUB_EVENTHANDLER+1 -- add a new event type, perhaps 
> OK, what about maxsockets code? Should it be changed to?
> -Maxim

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