Hi Dave,
Please allow me to explain from where I believe my CPU consumption is
occuring.
I believe that I have used functions header_generic and header_simple_table
in an errornous manner.
I am not able to find the difference between the variable *name passed in
the function parameter of my FindVarMethod and the variable vp->name also
available. Where is the oid in the snmp request? is it in vp->name or in
*name?
In addition, I have an octet-string as index for my tables, I know that I
can't use the function header_simple_table but I don't know what function
should I use or the algorithm needed to write such a function.
I have noticed a weird behavior in the snmp requests which i believe is
coming from the fact that I am failing to see the difference between the
variables, below is an example of this behavior:
command used:
snmpwalk -v 2c -c public localhost test
my FindVarMethod:
u_char *var_simple(struct variable *vp, oid *name, size_t *length, int
exact, size_t *var_len,
WriteMethod **write_method)
{
static int val;
char OIDReq[MAX_SIZE];
printf("Handling a simple request");
if (header_generic(vp,name,length,exact,var_len,write_method)==
MATCH_FAILED )
{
return NULL;
}
snprint_objid(OIDReq,MAX_SIZE, name,*length);
printf("Requested OID: %s",OIDReq);
//OIDReq contains the oid requested search for it and return value if found
or return null if not found ....,
}
Below is log:
Handling a simple request
Handling a simple request
Requested OID: enterprises.jinny.generic.test.license.0
enterprises.jinny.generic.test.license found returning 1000
Handling a simple request
Handling a simple request
Requested OID: enterprises.jinny.generic.test.active-sub.0
test.active-sub not found returning 0
Handling a simple request
Handling a simple request
Requested OID: enterprises.jinny.generic.test.active-sub.0
test.active-sub not found returning 0
Handling a simple request
Handling a simple request
Requested OID: enterprises.jinny.generic.test.profact-total.0
enterprises.jinny.generic.test.profact-total found returning 1
Handling a simple request
Handling a simple request
Requested OID: enterprises.jinny.generic.test.profact-total.0
enterprises.jinny.generic.test.profact-total found returning 1
Handling a simple request
Handling a simple request
Requested OID: enterprises.jinny.generic.test.profact-err.0
enterprises.jinny.generic.test.profact-err found returning 1
Handling a simple request
Handling a simple request
Requested OID: enterprises.jinny.generic.test.profact-err.0
enterprises.jinny.generic.test.profact-err found returning 1
//and it continues like this, every request is sent two times
Could you please inform me if the behavior is correct? Why is the request
one time for test.license and two times for every other counter?
I have other problems also when it comes to table but i think these problems
are related
I appreciate your help
Reagrds,
Marwan
----- Original Message -----
From: "Dave Shield" <[email protected]>
To: "Marwan Khoury" <[email protected]>
Cc: <[email protected]>
Sent: Saturday, August 22, 2009 8:46 PM
Subject: Re: CPU consumption
> 2009/8/19 Marwan Khoury <[email protected]>:
>> How can I add caching to the table?
>
> There is a cache helper designed specifically for this purpose.
> You can 'inject' this helper into the handler chain, before your
> MIB table handler, and it will invoke routines (which you should
> provide) to load and release the cache appropriately.
>
> This is used in a number of the existing MIB modules, which can
> be used as an example of the technique. See the current agent code for
> details.
>
> Dave
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