Thread (64 messages) 64 messages, 8 authors, 2006-07-06

Re: [PATCH 39 of 39] IB/ipath - use streaming copy in RDMA interrupt handler to reduce packet loss

From: Bryan O'Sullivan <hidden>
Date: 2006-06-29 23:34:26
Also in: lkml

On Thu, 2006-06-29 at 15:03 -0700, David Miller wrote:
I'm not good with names :-)
Heh.  I'll call it memcpy_nc for now, then, and people can retch all
over the name as they please when I submit a more suitably generic
patch.
Note that there also might be cases where using such a memcpy
variant might be the wrong thing to do.  For example, for a very
tightly coupled CMT cpu implementation which has the memory controller,
L2 cache, PCI controller, etc. all on the same die and the PCI controller
makes use of the L2 cache just like the cpu threads do, using this
kind of memcpy would always be the wrong thing to do.
I'm not quite following you, though I assume you're referring to Niagara
or Rock :-)  Are you saying a memcpy_nc would do worse than plain
memcpy, or worse than some other memcpy-like routine?

	<b
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