linux-kernel - Re: Socket Direct Protocol: help (2)

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Message-ID: <4BC4D22A.6020700@opengridcomputing.com>
Date:	Tue, 13 Apr 2010 15:20:58 -0500
From:	Steve Wise <swise@...ngridcomputing.com>
To:	"Tung, Chien Tin" <chien.tin.tung@...el.com>
CC:	Andrea Gozzelino <Andrea.Gozzelino@....infn.it>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"rolandd@...co.com" <rolandd@...co.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"pavel@....cz" <pavel@....cz>, "mingo@...e.hu" <mingo@...e.hu>,
	Eric B Munson <ebmunson@...ibm.com>
Subject: Re: Socket Direct Protocol: help (2)

Tung, Chien Tin wrote:
>>> NE020 supports 4 SGEs.  I don't know enough about SDP to know why it is
>>> using this calculation for # of send_sge:
>>>
>>> #define SDP_MAX_RECV_SKB_FRAGS (PAGE_SIZE > 0x8000 ? 1 : 0x8000 / PAGE_SIZE)
>>>
>>>
>>>       
>> Chien, does the NE020 support FMRs?  I looked at the nes ofed-1.5 code
>> and it appears to do nothing in the map_phys_fmr functions.
>>     
>
> We never implemented map_phys_fmr.  Is it relevant to the # of SGEs?
>   
No, but SDP uses FMRs.  I don't think it will run without FMR support.


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