netdev - RE: igb bandwidth allocation configuration

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Message-ID: <382A478CAD40FA4FB46605CF81FE39F43AE5BFC7@orsmsx507.amr.corp.intel.com>
Date:	Tue, 15 Sep 2009 11:25:31 -0700
From:	"Nelson, Shannon" <shannon.nelson@...el.com>
To:	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	Or Gerlitz <ogerlitz@...taire.com>
CC:	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Simon Horman <horms@...ge.net.au>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	Alexander Duyck <alexander.duyck@...il.com>
Subject: RE: igb bandwidth allocation configuration

Alexander Duyck wrote: 
>Or Gerlitz wrote:
>> I'm was asking/wondering if the Intel NICs have a rate limiter (i.e one 
>> can program the VF such that its rate doesn't exceed XX MB/s) or a "rate 
>> guarantee"  (i.e one can program the VF such that its guaranteed it will 
>> get YY MB/s in case it wants to xmit at least this bandwidth)
>
>Based on the way I am reading the documentation I would say the all 
>these registers do is guarantee a minimum percentage of the bandwidth. 

FYI, the newer 10gig 82599 *does* have a rate limiting feature in hw.  This feature is not currently supported by the ixgbe driver.

sln
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