From: "Douglas A. Gwyn" <DAGwyn@null.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] RDMA: DMA over TCP/IP at IETF
Date: Tue, 11 Dec 2001 10:08:02 +0000 [thread overview]
Message-ID: <3C15925F.73746F2A@null.net> (raw)
In-Reply-To: <200112102218.IAA08394@hadrian.staff.apnic.net>
George Michaelson wrote:
> simple abstraction or inevitable nightmare?
I don't think it's really either of those,
but rather an adjustment of implementation
to avoid wasting so many cycles on simply
copying data around when it should already
be within reach of the application. This
kind of thing has been done within a host
many times, e.g. on some variants of Unix
there were hacks so that a user-mode buffer
that an application arranged to be page-
aligned would be directly mapped onto the
kernel address space so DMA (for example)
would directly get/put the data where the
application wanted it. It would of course
be much better if this didn't have to be
done as a hack.
next prev parent reply other threads:[~2001-12-11 10:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-11 13:17 George Michaelson
2001-12-11 10:08 ` Douglas A. Gwyn [this message]
2001-12-11 10:57 ` Boyd Roberts
2001-12-12 9:47 ` Douglas A. Gwyn
2001-12-12 11:11 ` Boyd Roberts
2001-12-12 13:46 rob pike
2001-12-12 17:30 ` Boyd Roberts
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