From: Dan Malek <dan@embeddededge.com>
To: Clemens Koller <clemens.koller@anagramm.de>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: MPC85xx DMA support for Kernel 2.6?
Date: Thu, 30 Jun 2005 14:52:15 -0400 [thread overview]
Message-ID: <427c70958bb995dad4fbad2e6ff121bc@embeddededge.com> (raw)
In-Reply-To: <42C4162E.4030602@anagramm.de>
On Jun 30, 2005, at 11:56 AM, Clemens Koller wrote:
> *Sigh*... no holiday for me this summer .-(
Before you start, just make sure such a thing is really a performance
enhancement. Yes, the DMA does run in parallel with the core, but often
the overhead of the set up and clean up interrupt is more code and time
that if you just copied the data in a loop. If possible, integrate the
DMA
processing into other driver work, clean up a previous DMA the next time
the driver needs to use it, not with a separate completion handler.
Thanks.
-- Dan
next prev parent reply other threads:[~2005-06-30 18:52 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-30 15:12 MPC85xx DMA support for Kernel 2.6? Clemens Koller
2005-06-30 15:30 ` Kumar Gala
2005-06-30 15:56 ` Clemens Koller
2005-06-30 16:57 ` Murray.Jensen
2005-07-01 7:54 ` Clemens Koller
2005-07-01 8:36 ` Murray.Jensen
2005-07-01 13:59 ` Kumar Gala
2005-06-30 18:52 ` Dan Malek [this message]
2005-07-01 7:47 ` Clemens Koller
2005-07-01 14:02 ` Dan Malek
2005-07-01 14:15 ` Mark Chambers
2005-07-01 21:49 ` Dan Malek
2005-07-04 9:03 ` Clemens Koller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=427c70958bb995dad4fbad2e6ff121bc@embeddededge.com \
--to=dan@embeddededge.com \
--cc=clemens.koller@anagramm.de \
--cc=linuxppc-embedded@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).