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List:       lustre-devel
Subject:    Re: [Lustre-devel] Re: Lustre-devel digest, Vol 1 #244 - 3 msgs
From:       Peter Braam <braam () clusterfs ! com>
Date:       2003-07-09 18:09:46
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On Wed, Jul 09, 2003 at 10:10:12AM -0600, Hsing-bung Chen wrote:
> Hi,
> I have two questions about how to exchange data/information between two linux
> nodes
>    1.  when programs are running in the kernel mode -> exchange data directly
> from kernel mode between tow nodes

The Linux Lustre file system and Linux servers transfer data that is
referenced through the kernel address spaces.

Lib Lustre (running on Windows and Linux presently) can only use the
(TCP) socknal.  This transfers data through a socket from user space
on the lib side to the kernel address spaces.  For this we use a user
level NAL that can communicate with the kernel NAL's on the other
side. 

We will also build user level servers, so then any combination of
address spaces can exist.   I think the Portals api needs to be
present, optimally, between any two of the address space choices.

- Peter -


  or
>    2.  exchange data between user and kernel address space on the same node then
> exchange
>         data between two nodes using socket (user node)
> 
> I am running to some problems when I tried to exchange Infiniband HCA setup
> information between
> two nodes.  NAL is running in kernel mode.
> Your help is highly appreciated.
> Thanks.
> 
> HB Chen
> hbchen@lanl.gov
> 505-665-3591
> 
> 
> 
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- Peter -


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