From: "Jesse Brandeburg" <jesse.brandeburg@gmail.com>
To: "Jeffrey V. Merkey" <jmerkey@soleranetworks.com>
Cc: "Linux kernel" <linux-kernel@vger.kernel.org>,
"NetDEV list" <netdev@vger.kernel.org>
Subject: Re: e1000 driver 2.6.18 - how to waste processor cycles
Date: Thu, 9 Nov 2006 14:45:34 -0800 [thread overview]
Message-ID: <4807377b0611091445s11575f5ej15c7bf7126bb5658@mail.gmail.com> (raw)
In-Reply-To: <4552EAFC.5060400@soleranetworks.com>
On 11/9/06, Jeffrey V. Merkey <jmerkey@soleranetworks.com> wrote:
> In the case I am referring to, the memory is already mapped with a
> previous call, which means it may be getting
> mapped twice.
I guess maybe I'm not keeping up with you. This is what I see looking
in 2.6.18, i see e1000_clean_rx_irq:
check done bit
pci_unmap_single
copybreak and recycle
OR
hand buffer up stack
the only branch before the unmap is the napi break out, and in that
case we don't change any memory state, so alloc will not do anything.
As for alloc rx, we always map, because we always unmapped.
Did I miss something? I would appreciate a more detailed explanation
of what you see going wrong.
next prev parent reply other threads:[~2006-11-09 22:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-08 21:38 Jeff V. Merkey
2006-11-09 1:01 ` Jesse Brandeburg
2006-11-09 2:43 ` David Miller
2006-11-09 8:46 ` Jeffrey V. Merkey
2006-11-09 22:45 ` Jesse Brandeburg [this message]
2006-11-09 22:49 ` Jeff V. Merkey
2006-11-09 22:54 ` Jeff V. Merkey
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=4807377b0611091445s11575f5ej15c7bf7126bb5658@mail.gmail.com \
--to=jesse.brandeburg@gmail.com \
--cc=jmerkey@soleranetworks.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.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
all inboxes | Powered by JetHome®