From: Jeff Garzik <jgarzik@pobox.com>
To: Roland Dreier <roland@topspin.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, openib-general@openib.org
Subject: Re: [PATCH][16/26] IB/mthca: mem-free doorbell record writing
Date: Thu, 03 Mar 2005 19:41:06 -0500 [thread overview]
Message-ID: <4227AEA2.8060007@pobox.com> (raw)
In-Reply-To: <52vf88ntbo.fsf@topspin.com>
Roland Dreier wrote:
> Jeff> Are you concerned about ordering, or write-combining?
>
> ordering... write combining would be fine.
>
> Jeff> I am unaware of a situation where writes are re-ordered into
> Jeff> a reversed, descending order for no apparent reason.
>
> Hmm... I've seen ppc64 do some pretty freaky reordering but on the
> other hand that's a 64-bit arch so we don't care in this case. I
> guess I'd rather keep the barrier there so we don't have the
> possibility of a rare hardware crash when the HCA just happens to read
> the doorbell record in a corrupt state.
Well, we don't just add code to "hope and pray" for an event that nobody
is sure can even occur...
Does someone have a concrete case where this could happen? ever?
Jeff
next prev parent reply other threads:[~2005-03-04 0:48 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-03 23:20 [PATCH][0/26] InfiniBand merge Roland Dreier
2005-03-03 23:20 ` [PATCH][1/26] IB: fix ib_find_cached_gid() port numbering Roland Dreier
2005-03-03 23:20 ` [PATCH][2/26] IB/mthca: CQ minor tweaks Roland Dreier
2005-03-03 23:20 ` [PATCH][3/26] IB/mthca: improve CQ locking part 1 Roland Dreier
2005-03-03 23:20 ` [PATCH][4/26] IB/mthca: improve CQ locking part 2 Roland Dreier
2005-03-03 23:20 ` [PATCH][5/26] IB/mthca: CQ cleanups Roland Dreier
2005-03-03 23:20 ` [PATCH][6/26] IB: remove unsignaled receives Roland Dreier
2005-03-03 23:20 ` [PATCH][7/26] IB/mthca: map registers for mem-free mode Roland Dreier
2005-03-03 23:20 ` [PATCH][8/26] IB/mthca: add UAR allocation Roland Dreier
2005-03-03 23:20 ` [PATCH][9/26] IB/mthca: dynamic context memory mapping for mem-free mode Roland Dreier
2005-03-03 23:20 ` [PATCH][10/26] IB/mthca: mem-free memory region support Roland Dreier
2005-03-03 23:20 ` [PATCH][11/26] IB/mthca: mem-free EQ initialization Roland Dreier
2005-03-03 23:20 ` [PATCH][12/26] IB/mthca: mem-free interrupt handling Roland Dreier
2005-03-03 23:20 ` [PATCH][13/26] IB/mthca: tweak firmware command debug messages Roland Dreier
2005-03-03 23:20 ` [PATCH][14/26] IB/mthca: tweak MAP_ICM_page firmware command Roland Dreier
2005-03-03 23:20 ` [PATCH][15/26] IB/mthca: mem-free doorbell record allocation Roland Dreier
2005-03-03 23:20 ` [PATCH][16/26] IB/mthca: mem-free doorbell record writing Roland Dreier
2005-03-03 23:20 ` [PATCH][17/26] IB/mthca: refactor CQ buffer allocate/free Roland Dreier
2005-03-03 23:20 ` [PATCH][18/26] IB/mthca: mem-free CQ initialization Roland Dreier
2005-03-03 23:20 ` [PATCH][19/26] IB/mthca: mem-free CQ operations Roland Dreier
2005-03-03 23:20 ` [PATCH][20/26] IB/mthca: mem-free QP initialization Roland Dreier
2005-03-03 23:20 ` [PATCH][21/26] IB/mthca: mem-free address vectors Roland Dreier
2005-03-03 23:20 ` [PATCH][22/26] IB/mthca: mem-free work request posting Roland Dreier
2005-03-03 23:20 ` [PATCH][23/26] IB/mthca: mem-free multicast table Roland Dreier
2005-03-03 23:20 ` [PATCH][24/26] IB/mthca: QP locking optimization Roland Dreier
2005-03-03 23:20 ` [PATCH][25/26] IB/mthca: implement query of device caps Roland Dreier
2005-03-03 23:20 ` [PATCH][26/26] IB: MAD cancel callbacks from thread Roland Dreier
2005-03-04 0:07 ` Jeff Garzik
2005-03-04 0:30 ` Roland Dreier
2005-03-04 0:34 ` [openib-general] Re: [PATCH][26/26] IB: MAD cancel callbacks fromthread Sean Hefty
2005-03-04 0:43 ` Roland Dreier
2005-03-04 1:01 ` Andrew Morton
2005-03-04 1:07 ` Andrew Morton
2005-03-04 1:22 ` Andrew Morton
2006-03-13 15:43 ` [PATCH 5/6 v2] IB: IP address based RDMA connection manager Roland Dreier
2006-03-13 15:43 ` Roland Dreier
2006-03-13 17:11 ` Sean Hefty
2006-03-13 17:26 ` Roland Dreier
2006-03-13 17:26 ` Roland Dreier
2006-03-13 17:11 ` Sean Hefty
2005-03-04 0:04 ` [PATCH][16/26] IB/mthca: mem-free doorbell record writing Jeff Garzik
2005-03-04 0:33 ` Roland Dreier
2005-03-04 0:41 ` Jeff Garzik [this message]
2005-03-04 0:50 ` Roland Dreier
2005-03-04 0:35 ` [PATCH][3/26] IB/mthca: improve CQ locking part 1 Jeff Garzik
2005-03-04 0:40 ` Roland Dreier
2005-03-04 0:58 ` Greg KH
2005-03-04 1:02 ` Roland Dreier
2005-03-04 16:33 ` Greg KH
2005-03-04 16:43 ` Roland Dreier
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