[ewg] [Fwd: [ofa-general] [PATCH 0/2] IB: Improve recovery from SM change events after takeover]

[Hal Rosenstock]

On Sun, 2008-05-18 at 17:49 +0300, Moni Shoua wrote:
> Hi Vlad,
> I have 2 patches for ewg that were released to upstream kernel (see below)
> The first was approved unofficially and I hope that the second one will also be approved.

Why doesn't the second patch wait for approval/inclusion in Roland's
tree ? I thought that was the agreed upon process.

-- Hal

> Please add the patches (in attachments)  in kernel_patches/fixes under ofa-kernel.
> 
> thanks
> 
> Moni
> 
> -------- Original Message --------
> Subject: [ofa-general] [PATCH 0/2] IB: Improve recovery from SM change events	after takeover
> Date: Sun, 18 May 2008 15:25:24 +0300
> From: Moni Shoua <monis at Voltaire.COM>
> To: Roland Dreier <rdreier at cisco.com>
> CC: Olga Stern <olgas at voltaire.com>,	OpenFabrics General <general at lists.openfabrics.org>,	Moni Levy <monil at voltaire.com>
> 
> 
> The patches below improve the the recovery of the IPoIB driver from
> a faulure of  the SM and taking over by another SM. The purpose was
> to minimize the the time that 2 hosts with IPoIB stay remain disconnected
> after SM takeover event. 
> 
> Here is an example that was viewed in our tests.
> One IPoIB host (client) sends a stream of multicast packets to another IPoIB host (server).
> SM takeover event takes place during traffic and as a result multicast info is flushed
> and there is a need to rejoin by hosts. Without the patch there is a chance (which according to our experience
> is a very big chance) that the request to rejoin will be to the old  SM and only after a retry join completes successfully.
> 
> Our tests for IP multicast and unicast traffic between 2 hosts show that without the patch there
> is a period of time of  up to 5  seconds  that that communication is lost and with the
> patch the time decreases  to less than a second.
> 
> 
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