From: Ira Weiny <weiny2-i2BcT+NCU+M@public.gmane.org>
To: "kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org"
<kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Cc: Yevgeny Kliteynik
<kliteyn-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
OpenFabricsEWG
<ewg-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org>,
Linux RDMA <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org>,
Tziporet Koren <tziporet-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>,
"Mark A. Grondona" <mgrondona-i2BcT+NCU+M@public.gmane.org>,
"Moody, Adam T." <moody20-i2BcT+NCU+M@public.gmane.org>
Subject: Re: OFED 1.5.2: libibumad.so version bump
Date: Tue, 31 Aug 2010 12:49:15 -0700 [thread overview]
Message-ID: <20100831124915.ac4dc1bd.weiny2@llnl.gov> (raw)
In-Reply-To: <4C7CCB01.909-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
On Tue, 31 Aug 2010 02:27:29 -0700
Yevgeny Kliteynik <kliteyn-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Hi all,
>
> In order to support RoCEE, a while ago I've added
> a new field to umad, thus introduced an ABI change.
>
> There already was a discussion on the linux-rdma list,
> but due to the proximity of the upcoming OFED 1.5.2
> release these concerns were raised again.
>
> So my question is, other that *general* concerns about
> changing ABI, is anybody aware of the *actual* problem
> that will be caused by this? Any customer/3rd party
> solution that would be affected by this?
Because our MVAPICH depends on umad, libibumad.so.1 to be exact.[*] These ABI
changes (to v2 and v3) would have forced our users to recompile their codes.
We are maintaining the old ABI here until our next major release of CHAOS[#]
to prevent this.
I think the thing to remember is that many people are using Open Fabrics
software, but are _not_ using "OFED". What is tested with OFED is not the
only thing which might be using these libraries. Our version of MVAPICH is a
good example.
I am certainly not the expert in this area and I know that many people have
tried to make this point in the past, but I will say it here again. Each of
these Open Fabrics packages _must_ be maintained to stand on their own.
Roland did this a long time ago with ibverbs.
I think now is a good time to start discussing breaking up the "management" git
tree so that these libraries can live on their own. I will write a separate
email regarding this.
Ira
[*] We are looking into removing the dependency.
[#] Shameless plug: http://code.google.com/p/chaos-release/wiki/CHAOS_Description
>
> -- Yevgeny
> --
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>
--
Ira Weiny
Math Programmer/Computer Scientist
Lawrence Livermore National Lab
925-423-8008
weiny2-i2BcT+NCU+M@public.gmane.org
--
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next prev parent reply other threads:[~2010-08-31 19:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-31 9:27 OFED 1.5.2: libibumad.so version bump Yevgeny Kliteynik
[not found] ` <4C7CCB01.909-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2010-08-31 19:49 ` Ira Weiny [this message]
[not found] ` <20100831124915.ac4dc1bd.weiny2-i2BcT+NCU+M@public.gmane.org>
2010-09-02 20:35 ` Hal Rosenstock
[not found] ` <AANLkTim1_D5+GMWX80X0afu8A8_kizbQUq1KUhxxSLpz-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-09-02 21:05 ` Ira Weiny
[not found] ` <20100902140502.62489af7.weiny2-i2BcT+NCU+M@public.gmane.org>
2010-09-02 21:52 ` Jason Gunthorpe
2010-09-03 20:18 ` Hal Rosenstock
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