Hi Roland,
On 4/26/07, Roland Dreier <[EMAIL PROTECTED]> wrote:
Abhinav> However, VAPI has an event which specifies the successful
Abhinav> transition of MIGRATED -> ARMED (I know very well, that
Abhinav> it is done through modify_qp). But just the success of
Abhinav> modify_qp does not explicitly tell the time at which the
Abhinav> transition successfully occured, does it?
You don't know the time that the transition occurred, except that it
is between when you called modify QP and when it returned. But an
asynchronous event doesn't really help, does it?
It does help. APM is not only defined for network fault tolerance, it can
also be used for load-balancing. With this event, one can know when
the path is loaded and it is safe to call modify_qp.
Also, do you have any script which can potentially bring a port down
from Active state, without actually unplugging the cable? Please let
me know.
Thanks,
:- Abhinav
All an event would
tell you is that the transition occurred some time before the event was
generated, which is some time before when the event was delivered to you.
Abhinav> Specifically:
Abhinav> VAPI_PATH_MIG_ARMED would make my day. I believe that
Abhinav> VAPI_QP_PATH_MIGRATED is similar to
Abhinav> IB_EVENT_PATH_MIG. Please correct me if i am wrong.
I see... VAPI_PATH_MIG_ARMED is a new event that was added only in
VAPI 4.1.0, which was why I didn't know about it. Only Mellanox HCAs
support it, it is not specified by the InfiniBand architecture, and I
don't really see the point of it (as I tried to explain above).
- R.
--
Abhinav Vishnu
Graduate Student
Computer Science and Engineering
The Ohio State University
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