From: Dan Aloni <da-x@monatomic.org>
To: Luke-Jr <luke-jr@utopios.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2.4.x] prevent emulated SCSI hosts from wasting DMA memory
Date: Wed, 30 Nov 2005 23:02:23 +0200 [thread overview]
Message-ID: <20051130210222.GA32431@localdomain> (raw)
In-Reply-To: <200511301933.48668.luke-jr@utopios.org>
On Wed, Nov 30, 2005 at 07:33:47PM +0000, Luke-Jr wrote:
> On Wednesday 30 November 2005 17:15, Dan Aloni wrote:
> > Emulated scsi hosts don't do DMA, so don't unnecessarily increase
> > the SCSI DMA pool.
>
> They don't? Recently I learned(?) that apparently using hdparm -d on the
> old /dev/hdX device still worked/applied when using ide-scsi... or do
> "emulated scsi hosts" refer to something else?
Actually by 'do DMA' I meant use the scsi_malloc() interface - which
is mostly used by low level drivers. The IDE drivers allocate their
DMA memory outside the SCSI layer. iSCSI hosts for instance, don't
need to cause unnecessary DMA allocations.
--
Dan Aloni
da-x@monatomic.org, da-x@colinux.org, da-x@gmx.net
next prev parent reply other threads:[~2005-11-30 21:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-30 17:15 [PATCH 2.4.x] prevent emulated SCSI hosts from wasting DMA memory Dan Aloni
2005-11-30 19:33 ` Luke-Jr
2005-11-30 21:02 ` Dan Aloni [this message]
2005-12-01 11:36 ` Christoph Hellwig
2005-12-01 15:39 ` Dan Aloni
2005-12-21 18:17 ` Marcelo Tosatti
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=20051130210222.GA32431@localdomain \
--to=da-x@monatomic.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luke-jr@utopios.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