On Wed, Aug 10, 2016 at 8:52 PM, Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> wrote:
> On 8/9/2016 12:26 PM, Jinpu Wang wrote:
>> Hi Sean,
>>
>> I'm testing QoS support for IB. I notice ucmatose has equally
>> performance when set different service type, but set SL in ib_send_bw
>> works well (different SL show different performance base on opensm
>> settings)
>>
>> I capature packats using ibdump, it shows in in LRH the service level
>> fields are all 0 when running traffic with ucmatose.
>>
>> When running ib_send_bw, it carries the right service level I set.
>>
>> Seems in rdma_set_service_type, it sets to tos to id_priv->tos, and
>> lter set to path_rec->qos_class or traffic_class but not to sl
>> directly, what's the consideration here?
>> code snip:
>>         switch (cma_family(id_priv)) {
>>         case AF_INET:
>>                 path_rec->qos_class = cpu_to_be16((u16) id_priv->tos);
>>                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
>>                 break;
>>         case AF_INET6:
>>                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
>>                 path_rec->traffic_class = (u8)
>> (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
>>                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
>>                 break;
>>         case AF_IB:
>>                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
>>                 path_rec->traffic_class = (u8)
>> (be32_to_cpu(sib->sib_flowinfo) >> 20);
>>
>>
>> Does it make sense we also set sl here, or service type for ucmatose
>> is totally different with SL for ib_send_bw?
>
> I think this is an OpenSM configuration issue. QoS policy needs to be
> setup to return the proper SL to use for QoS class or TClass in the
> PathRecord response.
>
> -- Hal
>
Thanks Hal,

Configure extra QoS policy seems quite complex.
Do you think patch attached make sense?





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Jack Wang

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