[openib-general] Shared Receive Queue

[Tziporet Koren]

The performance of SRQ was improved to be identical to regular QP in the
latest FW release for all devices.
Tziporet

-----Original Message-----
From: Galen M. Shipman [mailto:gshipman at lanl.gov]
Sent: Tuesday, July 26, 2005 5:57 PM
To: Or Gerlitz
Cc: openib-general at openib.org
Subject: Re: [openib-general] Shared Receive Queue



I am using our own software which uses send receive in both cases. As  
I said the code paths are exactly the same except for posting of  
receive descriptors as well as initialization.

- Galen

On Jul 26, 2005, at 8:49 AM, Or Gerlitz wrote:

>> We have software which uses the mellanox shared receive queue and we
>> are seeing a substantial performance penalty (on the order of 4-5
>> usec on 0 byte messages).
>>
>
> Are you comparing code that sends short messages either by rdma write
> where the
> reciever does polling on memory (as done in some IB MPIs "short  
> message
> protocols")
> to code that uses send/recv with SRQ --or-- code that does send/recv
> where in one run
> the recv is to "non shared" queue (that is regular QP) and in the  
> other
> run to SRQ (QP attached to SRQ)?
>
> Or.
>
>

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