[ofa-general] Is response time of GMP is more than SMP
Sumit Gaur - Sun Microsystem
Sumit.Gaur at Sun.COM
Tue Jun 24 23:41:36 PDT 2008
Hal Rosenstock wrote:
> Hi Sumit,
> On Tue, 2008-06-24 at 14:21 +0530, Sumit Gaur - Sun Microsystem wrote:
>>I am using OFED 2.5.*
> 1.2.5.* ?
Sorry for typo .. it is 1.2.5.*
>> and observing that my SMI requests are serving very fast
>>and response time is very less on the contrary my GSI requests were served in
>>more time and response time sometime goes more than 2 sec. Any light on this
> What are the specific GS requests which are slow in response ? Are they
> compute intensive ?
I am sending only request for
rpc.mgtclass = IB_PERFORMANCE_CLASS;
rpc.method = IB_MAD_METHOD_GET;
at every one second.
> In general, there are a few possibilities (which can cause this). SM
> traffic is VL15 whereas GS traffic is on a data VL (usually VL0 in most
> Some possibilities are:
> 1. Timeout/retry being hit for some GS traffic (GS request or response
Yes, this is also happening, Sometimes I am getting corrupt data back, and if I
retry to send same request again it fails or send corrupted data back again.
> 2. Data VL busy (is there anything else utilizing VL0 ?)
Not sure about it. Is there anything to verify it? I am running openSM also but
not using it..
> 3. CPU busy (what other things are competing for CPU on the responder ?)
CPU utilization is ok.
and all requests are lid routed routed.
> -- Hal
>>Is it expected behavior if yes then why ?
>>Thanks and Regards
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