All of lore.kernel.org
 help / color / mirror / Atom feed
From: Larry Finger <Larry.Finger@lwfinger.net>
To: Julian Calaby <julian.calaby@gmail.com>
Cc: David Miller <davem@davemloft.net>,
	David.Laight@aculab.com, linville@tuxdriver.com,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	bittorf@bluebottle.com, stable@vger.kernel.org
Subject: Re: [PATCH] b43: Increase number of RX DMA slots
Date: Tue, 19 Feb 2013 20:42:02 -0600	[thread overview]
Message-ID: <512437FA.2030105@lwfinger.net> (raw)
In-Reply-To: <CAGRGNgWZ0qUJSSkjmP8o4VaPRBdN67J=RPy5+45rWaQQXWnWrQ@mail.gmail.com>

On 02/19/2013 06:47 PM, Julian Calaby wrote:
>
> Is it be possible to increase the number of slots at runtime? Maybe an
> even better solution would be to keep the existing number of slots,
> and if they run out, reset and increase incrementally to some sensible
> maximum value.

The number could be increased a bit, but on systems with 32-bit DMA such as the 
BCM4318, the maximum size of the ring buffer is 4KB. Even more importantly, each 
slot is allocated an skb of 2390 bytes. Even at 256 slots, the memory allocation 
is pretty large.

Larry


  reply	other threads:[~2013-02-20  2:42 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-18  3:01 [PATCH] b43: Increase number of RX DMA slots Larry Finger
2013-02-18  3:01 ` Larry Finger
2013-02-18 16:18 ` Rafał Miłecki
2013-02-18 16:18   ` Rafał Miłecki
2013-02-18 16:55   ` Bastian Bittorf
2013-02-18 16:55     ` Bastian Bittorf
2013-02-18 17:04     ` Larry Finger
2013-02-18 20:10   ` Larry Finger
2013-02-19 20:01     ` Bastian Bittorf
2013-02-19 20:01       ` Bastian Bittorf
2013-02-19  5:52 ` David Miller
2013-02-19  5:52   ` David Miller
2013-02-19  9:42   ` David Laight
2013-02-19  9:57     ` Rafał Miłecki
2013-02-19 17:57     ` Larry Finger
2013-02-19 18:15       ` David Miller
2013-02-19 18:28         ` Larry Finger
2013-02-20  0:47           ` Julian Calaby
2013-02-20  2:42             ` Larry Finger [this message]
2013-02-20  6:26               ` Gábor Stefanik
2013-02-20  6:26                 ` Gábor Stefanik
2013-02-20  7:15                 ` Larry Finger
2013-02-20  8:15                   ` Bastian Bittorf
2013-02-20  8:15                     ` Bastian Bittorf
2013-02-20 15:49                     ` Larry Finger

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=512437FA.2030105@lwfinger.net \
    --to=larry.finger@lwfinger.net \
    --cc=David.Laight@aculab.com \
    --cc=bittorf@bluebottle.com \
    --cc=davem@davemloft.net \
    --cc=julian.calaby@gmail.com \
    --cc=linux-wireless@vger.kernel.org \
    --cc=linville@tuxdriver.com \
    --cc=netdev@vger.kernel.org \
    --cc=stable@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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.