From: Arto Vuori <avuori@ssh.com>
To: acurtis@onz.com
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: 8260 IDMA experience?
Date: Mon, 03 Jun 2002 15:33:18 +0300 [thread overview]
Message-ID: <3CFB620E.9F8643EB@ssh.com> (raw)
In-Reply-To: NCBBIINEHIPFGJPLBEIFAEPFDHAA.acurtis@onz.com
Allen Curtis wrote:
>
> Does anyone have experience with IDMA on the 8260? Are there any special
> considerations if you wanted to use the memory-to-memory copy function in
> place of a memcpy()? (kernel memory only at this time)
I have been using IDMA to transfer data between kernel memory and a
FPGA. I also did some testing with memory-to-memory transfers and i
didn't find them to be worth the trouble. Performance ain't that great.
You probably get more speed by copying with your CPU, though you might
avoid some cache trashing.
I did also notice that when i am doing memory-to-peripheral (or
vice-versa) transfers, IDMA corrupts simultaneous Ethernet traffic
unless IDMA is set to low-priority mode. Same might apply for
memory-to-memory transfers.
Arto
--
Arto Vuori
email: avuori@ssh.com
mobile: +358 40 754 5223
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-06-03 12:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-01 3:15 8260 IDMA experience? Allen Curtis
2002-06-03 12:33 ` Arto Vuori [this message]
2002-06-03 13:20 ` Allen Curtis
2002-06-03 13:56 ` Arto Vuori
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