From: Jeff Garzik <jgarzik@mandrakesoft.com>
To: "MEHTA,HIREN (A-SanJose,ex1)" <hiren_mehta@agilent.com>
Cc: "'Ralf Baechle'" <ralf@uni-koblenz.de>,
"'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: pci_alloc_consistent question
Date: Fri, 19 Oct 2001 17:37:45 -0400 [thread overview]
Message-ID: <3BD09D29.2ACF840E@mandrakesoft.com> (raw)
In-Reply-To: <01A7DAF31F93D511AEE300D0B706ED9208E4A5@axcs13.cos.agilent.com>
"MEHTA,HIREN (A-SanJose,ex1)" wrote:
> so, what is the conservative number ? 1MB ?
FWIW, if you need more than 1-4MB, you can use alloc_bootmem at system
boot to reserve huge amounts of contiguous memory... (not that anything
but lame hardware requires that anymore)
> -----Original Message-----
> On Fri, Oct 19, 2001 at 12:32:19PM -0600, MEHTA,HIREN (A-SanJose,ex1) wrote:
>
> > Is there any limitation on the amount of contiguous dmaable memory that
> > can be allocated using a single call to pci_alloc_consistent() ?
>
> Entirely platform dependant. On some systems the total available DMA memory
> for DMA may be as limited as 1mb, others have limits like 16mb yet other can
> support the entire 32-bit address space for DMA. So in case of doubt be
> conservative.
--
Jeff Garzik | Only so many songs can be sung
Building 1024 | with two lips, two lungs, and one tongue.
MandrakeSoft | - nomeansno
next prev parent reply other threads:[~2001-10-19 21:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-19 21:24 pci_alloc_consistent question MEHTA,HIREN (A-SanJose,ex1)
2001-10-19 21:37 ` Jeff Garzik [this message]
2001-10-19 21:59 ` Ralf Baechle
-- strict thread matches above, loose matches on Subject: below --
2001-10-19 18:32 MEHTA,HIREN (A-SanJose,ex1)
2001-10-19 18:51 ` Francois Romieu
2001-10-19 20:57 ` Ralf Baechle
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=3BD09D29.2ACF840E@mandrakesoft.com \
--to=jgarzik@mandrakesoft.com \
--cc=hiren_mehta@agilent.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ralf@uni-koblenz.de \
/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