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From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Cc: Hal Rosenstock
	<hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Ira Weiny <weiny2-i2BcT+NCU+M@public.gmane.org>,
	"linux-rdma
	(linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org)"
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"ofw-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org"
	<ofw-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org>
Subject: Re: ib-diags: compatability issue with ibstat
Date: Fri, 23 Sep 2011 11:55:42 -0600	[thread overview]
Message-ID: <20110923175542.GN28454@obsidianresearch.com> (raw)
In-Reply-To: <4E7CC268.4000909-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>

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On Fri, Sep 23, 2011 at 01:31:20PM -0400, Hal Rosenstock wrote:

> > The only wonky bit
> > was that verbs was needed for subnet timeout because it isn't in
> > sysfs. Everything else went according to the spec.
> 
> I don't see how your algorithm can be compliant with just subnet timeout.

Really?

13.4.6.3  specifies the formula

                 CommTimeValueOut    CommTimeValueIn    RespTimeValue
4.096 µsec x ( 2                  +2                 +2               )

Which boils down to 

4.096 µsec x (2 x 2**(Subnet_Timeout) + 2**(RespTimeValue))

For the on subnet case.

RespTimeValue comes from the class port info of the target manager,
and C13-13.1.1 gives guidance what value to use for the initial class
port info query to get the value.

Which is exactly what I implemented.

It isn't hard.

Jason
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  parent reply	other threads:[~2011-09-23 17:55 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-21 19:06 ib-diags: compatability issue with ibstat Hefty, Sean
     [not found] ` <1828884A29C6694DAF28B7E6B8A8237316E66F5B-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-09-21 22:13   ` Ira Weiny
     [not found]     ` <20110921151349.140d95f6.weiny2-i2BcT+NCU+M@public.gmane.org>
2011-09-21 22:23       ` Hefty, Sean
     [not found]         ` <1828884A29C6694DAF28B7E6B8A8237316E6723E-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-09-21 22:32           ` Ira Weiny
     [not found]             ` <20110921153254.06c77ebc.weiny2-i2BcT+NCU+M@public.gmane.org>
2011-09-21 22:35               ` Jason Gunthorpe
     [not found]                 ` <20110921223546.GI28454-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2011-09-23 12:57                   ` Hal Rosenstock
     [not found]                     ` <CAKzyTsw8TKFNPS8QFgjag7XZ77cu=OzofAuAKTr_DQmkPTsogw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-09-23 16:57                       ` Jason Gunthorpe
     [not found]                         ` <20110923165758.GM28454-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2011-09-23 17:31                           ` Hal Rosenstock
     [not found]                             ` <4E7CC268.4000909-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2011-09-23 17:55                               ` Jason Gunthorpe [this message]
     [not found]                                 ` <20110923175542.GN28454-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2011-09-23 18:01                                   ` Hal Rosenstock
     [not found]                                     ` <4E7CC98E.5050408-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2011-09-23 18:22                                       ` Jason Gunthorpe
2011-09-22  0:14               ` Ira Weiny
     [not found]                 ` <20110921171408.4e4087c8.weiny2-i2BcT+NCU+M@public.gmane.org>
2011-09-23 13:13                   ` [ofw] " Hal Rosenstock
2011-09-23 16:15                     ` Hefty, Sean
2011-09-23 13:28   ` [ofw] " Hal Rosenstock
     [not found]     ` <CAKzyTsyH0rop69rTGUW_+kgfohyN-XiCLV4JsO9NLzyH9KpQAA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-09-23 13:45       ` Hal Rosenstock
     [not found]         ` <CAKzyTszJ8qbPMYgMFhAzkJVnGmgetggSU7BYN+1RxrVB3tBYqA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-09-23 16:21           ` Hefty, Sean
2011-09-23 16:33             ` Hal Rosenstock
2011-09-23 16:38               ` Hal Rosenstock
2011-09-23 16:40         ` [ofw] " Hefty, Sean
2011-09-23 16:44           ` Hal Rosenstock
     [not found]             ` <CAKzyTswr6EMFPn1fBNujP1Lgb8b6MEcJ1uPbVqEt_nE1Er7dPw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-09-23 17:15               ` [ofw] " Hefty, Sean
     [not found]                 ` <1828884A29C6694DAF28B7E6B8A8237316E677A9-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-09-26  6:19                   ` Ira Weiny

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