On 5/2/06, Or Gerlitz <[EMAIL PROTECTED]> wrote:
Ranjit Pandit wrote:
> Yes.
> There is no issue. It's just next in line for me to implement.
So what's remained to implement? if the app attempt to send data to
127.0.0.1 or a local IPoIB address then you are opening a connection to
this address over the CMA and in the passive "side" you just do
rdma_listen without binding to any device. In other words, no change on
the active side and a simplification of the passive side to support
this. Do i miss something here?
Loopback connections can be optimized by not going to the HCA.
In b-copy mode we can directly copy sends into destination sockets on
the same node.
>> +2 by failover, are you referring to APM? that is failover between IB
>> pathes to/from the same HCA
>> over which the original connection/QP was established or you are talking
>> on failover between HCAs
>
> Failover within and across HCAs. APM does not work for failover across
> HCAs.
I see. Can you remind me ... where is the location of the reference gen1
RDS code? does it support failover?
Yes, Rds reference implementation implements failover across HCAs.
It was checked into contrib/silverstorm/rds.
r3471 was the first checkin and then a few more updates were made with
bug fixes.
Also, for within the HCA failover, are you talking on APM or basically,
you apply the same failover scheme between to ports no matter if they
are on on the same HCA or on different HCAs?
Keep it simple ie., apply the same failover scheme between two ports
whether on same HCA or not.
Are you aware to something in the openib infrastructure which is missing
for the failover design of RDS? if you specify the design/requirements i
am sure people on this list can quickly say if something is missing...
For failover Rds need support for the following:
1. Ability to assign single IP address to multiple IB ports
2. Address resolution mechanism should return multiple paths for the
same destination IP address.
On SilverStorm stack a single IP address can be assigned to two ports
in the system.
When a path fails, RDS can re-establish connection to the same
destination IP address...ipoib_path( dst_ip) returns all possible
paths to the destination ip.
Does the CMA handle multiple paths to a destination IP?
It does not need to return multiple paths to Rds. For now, even if it
picks the first
available path that should be sufficient.
Or.
>> [openfabrics-ewg] Before we can start testing - we needto ensure that
>> RDS is fully ported.
>>
>> Pandit, Ranjit rpandit at silverstorm.com
>>
>> Following features are yet to be implemented in OpenFabric Rds:
>>
>> 1. Failover
>> 2. Loopback connections
>> 3. support for /proc fs like Rds config, stats and info.
>>
>>
>>
>> Ranjit
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