[ofa-general] Is response time of GMP is more than SMP

[Sumit Gaur - Sun Microsystem]

Hi Hal/Sashak,

Hal Rosenstock wrote:
> Hi Sumit,
> 
> On Tue, 2008-06-24 at 14:21 +0530, Sumit Gaur - Sun Microsystem wrote:
> 
>>Hi,
>>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 
>>different behavior.
> 
> 
> 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
> subnets).
> 
> Some possibilities are:
> 1. Timeout/retry being hit for some GS traffic (GS request or response
> lost/corrupted)
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
>>sumit
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>