From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Anuj Kalia <anujkaliaiitd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Gabriele Svelto
<gabriele.svelto-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: RDMA and memory ordering
Date: Wed, 13 Nov 2013 11:09:15 -0700 [thread overview]
Message-ID: <20131113180915.GA6597@obsidianresearch.com> (raw)
In-Reply-To: <CADPSxAhzmaut9s9L1fv5urhzX8xKU9GbL6z1TkOX3FuM4NUsww-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Wed, Nov 13, 2013 at 02:55:53AM -0400, Anuj Kalia wrote:
> I don't know what you meant by burst writes: do you mean several RDMA
> writes or one large write? I'm concered with the order in which data
A RDMA write will be split up by the HCA into a burst of PCI MemoryWr
operations.
> I guess now is the time I run lots of micro experiments. Thanks a lot
> for the help everyone.
Carefull, experiments can't prove that order is guranteed to be
present, they can only show if it certainly isn't.
Intel hardware is very good at hiding ordering issues 99% of the time,
but in many cases there can be a stress'd condition that will show a
different result.
Jason
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next prev parent reply other threads:[~2013-11-13 18:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-10 10:46 RDMA and memory ordering Anuj Kalia
[not found] ` <CADPSxAhAGYZude8CM65-UDvfiPscStgcNsAfs=2XBbntg-wL0w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-11-12 10:16 ` Gabriele Svelto
[not found] ` <5281FFF9.5070705-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-11-12 10:31 ` Anuj Kalia
2013-11-12 18:31 ` Jason Gunthorpe
[not found] ` <20131112183142.GB6639-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2013-11-12 20:59 ` Anuj Kalia
[not found] ` <CADPSxAgF1CAiYoYbxbCON4NCD-tH8cAsJFRtECkTGJJQC4MXCg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-11-12 21:11 ` Jason Gunthorpe
[not found] ` <20131112211123.GA29132-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2013-11-13 6:55 ` Anuj Kalia
[not found] ` <CADPSxAhzmaut9s9L1fv5urhzX8xKU9GbL6z1TkOX3FuM4NUsww-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-11-13 18:09 ` Jason Gunthorpe [this message]
[not found] ` <20131113180915.GA6597-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2013-11-14 5:12 ` Anuj Kalia
[not found] ` <CADPSxAiepGuzWYXjyDxnSzER5MqL57fZ9mh83SLwV461PwZO3Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-11-14 19:05 ` Jason Gunthorpe
[not found] ` <20131114190514.GB21549-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2013-11-14 19:33 ` Anuj Kalia
[not found] ` <CADPSxAg0k5SuxCX=3CMNV8-xME55p3iL4BMqnq0ji---kN6ZEg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-11-14 19:47 ` Anuj Kalia
2013-11-13 18:23 ` Gabriele Svelto
[not found] ` <5283C3B2.6010106-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-11-14 2:11 ` Anuj Kalia
-- strict thread matches above, loose matches on Subject: below --
2013-11-11 23:13 Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A8237388CF721E-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2013-11-12 7:28 ` Anuj Kalia
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