[ECOS] Re: "PANIC: zinit: Out of memory" when num sockets increased to 64

Gary Thomas gary@mlbassoc.com
Wed Apr 9 16:10:00 GMT 2008


Grant Edwards wrote:
> On 2008-04-09, Gary Thomas <gary@mlbassoc.com> wrote:
> 
>>> Several other people seem to have tripped over this bug.  IMO,
>>> the problem is that the default value takes the number of
>>> sockets into account, and the description claims that value is
>>> guaranteed to allow the network stack to start up.
>>>
>>> One presumes that the minimum value required for stack startup
>>> could be calculated at configure time based on the max number
>>> of sockets.  Since that isn't being done, should I submit a
>>> patch that would change the description so that it doesn't say
>>> that it is?
>> Or, better yet, improve the CDL so it behaves as folks expect :-)
> 
> That would definitely be better.  I presume if the formula for
> the required amount of memory were known somebody would have
> fixed the CDL already.
> 
> Is it practical to figure out how much is required by
> statically examining the source code, or would it be simpler to
> just do it emperically/experimentally?
> 

The formula that's in place was done by me, examining the code.
I think the problem is that since I made that analysis, additional
terms have been introduced (e.g. back then, there was no/little
notion of file descriptors).  These terms should be figured
into the result.  Of course, it gets a bit tricky as one wants
the number to "work" regardless of the configuration (e.g. you
_might_ build a system where there is no file system, so the
number of file descriptors is unknown, but you still want the
computation to be correct).

It's this sort of "moving target" (new features, variable
configurations, ...) that have made some configuration metrics
a bit hard to manage.  For example, why must one increase the
number of open files in [at least] two places, when surely one
should suffice?

Anything you can do so suggest improvements will surely be
useful and considered for adoption.


-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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