On Wednesday 26 August 2009 02:03, MANIKANTAN KALAIYA wrote:
> Resending to the mailing list...
>
> We have Ofed1.3.1 installed, one of the sub packages is libibverbs version
> 1.1.1. We have a small program that lists the number of IB cards available in
> the system through ibv_get_device_list(). See below for the sample code.
libibverbs reads the number of devices ONCE, at calling process startup (as
part of its initialization).
To get a new device count, you need to restart your program.
- Jack
> The system has two IB cards, the value returned by ibv_get_device_list() in
> 'num_devices' is two, as expected.
>
> However, when we disable one of the cards using the modprobe command, the
> program continues to return two cards present (monitoring is continuous in a
> while loop).
> Killing and restarting the sample test process results in reporting correct
> number of IB cards available (returns one after it is restarted). One of the
> prior versions was known to report the correct number of IB cards without
> requiring to restart the program.
>
> We would like to determine the number of cards present without having to go
> through a restart. Any inputs on this behavior is appreciated.
>
> modprobe command - "sudo modprobe -r ib_mthca"
>
> Test program:
> =================================================
> #include <stdio.h>
> #include <infiniband/verbs.h>
>
> int main(int argc, char **argv)
> {
> int ret, num_devices;
> struct ibv_device **dev_list;
>
> while(1) {
>
> dev_list = ibv_get_device_list(&num_devices);
>
> if (num_devices != 0) {
> printf("IB ADAPTER AVAILABLE:%d\n", num_devices);
> }
> else {
> printf("IB ADAPTER UNAVAILABLE\n");
> }
> sleep(2);
> ibv_free_device_list(dev_list);
> }
>
> return(0);
> }
> =================================================
>
> Thanks,
> Mani.
>
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