From: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
To: Ido Shamai <idos-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Cc: ib-x2spCj9RiN0z5UmgcLIfJQ@public.gmane.org,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: perftest question
Date: Tue, 17 May 2011 15:55:31 -0500 [thread overview]
Message-ID: <4DD2E0C3.5070905@opengridcomputing.com> (raw)
In-Reply-To: <4DD2CF58.5080806-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
On 05/17/2011 02:41 PM, Ido Shamai wrote:
> Those are actually the same tests, from an IB point of view.
>
> the difference between them is that ib_write_bw passes the arguments that need to be known to other side ( LID or GID,
> Qp num, PSN, RKey and the address of the writing buffer) before post_sending,
>
> through TCP connection (using sockets) and the rdma_bw uses the rdma_cm module , which sends those arguments through
> the IB wire and the SM.
>
> rdma_cm is not updated with all the features ib_write_bw have. I will work on this test shortly
>
> Ido
>
In addition, rdma_bw and rdma_lat work over iWARP when used with the --cma option. The ib_* versions do not since they
don't have a option to use the rdma_cm, which is required for setting up iWARP connections.
Steve.
>
> On 5/17/2011 10:19 PM, ib-x2spCj9RiN0z5UmgcLIfJQ@public.gmane.org wrote:
>> Just downloaded a snapshot of the perftests. In the README under "Test Descriptions" it says:
>>
>> rdma_bw.c streaming BW test with RDMA write transactions
>>
>> and
>>
>> write_bw.c BW test with RDMA write transactions
>>
>> What is the difference between rdma_bw and write_bw? I see that the rdma_bw description contains "streaming" where
>> as write_bw description does not... but I am not sure I understand what that means?
>>
>> E
>>
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prev parent reply other threads:[~2011-05-17 20:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-17 19:19 perftest question ib-x2spCj9RiN0z5UmgcLIfJQ
[not found] ` <20110517131910.3dw9cgbfj4ck04cw-x2spCj9RiN0z5UmgcLIfJQ@public.gmane.org>
2011-05-17 19:41 ` Ido Shamai
[not found] ` <4DD2CF58.5080806-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2011-05-17 19:53 ` ib-x2spCj9RiN0z5UmgcLIfJQ
[not found] ` <20110517135306.zxkyatjh2oows8co-x2spCj9RiN0z5UmgcLIfJQ@public.gmane.org>
2011-05-18 6:57 ` Ido Shamai
2011-05-17 20:55 ` Steve Wise [this message]
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