From: Alex Netes <alexne-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Sebastian Riemer
<sebastian.riemer-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Basics of congestion control?
Date: Tue, 31 Jul 2012 14:08:56 +0300 [thread overview]
Message-ID: <20120731110856.GD2077@calypso> (raw)
In-Reply-To: <5017A740.4020205-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
Hi Sebastian,
On 11:37 Tue 31 Jul , Sebastian Riemer wrote:
> Hi all,
>
> could someone please explain what I can do with the new congestion control?
>
> Do I understand it right that I can influence the flow control (e.g.
> amount of credits) with it so that I can avoid disruption (XmitWait,
> XmitDiscardedPackets) caused by congestion?
Congestion control isn't a credit based mechanism. While InfiniBand flow
control is defined between two ports of the same link, congestion control is
working across the fabric between a congestion point (a switch) and a reaction
point (source node). Reaction point implements a Congestion Control Table that
contains an array of values of injection rate delay used to control
congestion. You can find more information in the IBTA LWG Errata document
3Q2010.
-- Alex
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next prev parent reply other threads:[~2012-07-31 11:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-31 9:37 Basics of congestion control? Sebastian Riemer
[not found] ` <5017A740.4020205-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
2012-07-31 11:08 ` Alex Netes [this message]
2012-07-31 11:53 ` Sebastian Riemer
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