From: "Theodore Ts'o" <tytso@mit.edu>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Paul Fulghum <paulkf@microgate.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH] TTY flip buffer SMP changes
Date: Fri, 8 Oct 2004 11:00:55 -0400 [thread overview]
Message-ID: <20041008150055.GA13870@thunk.org> (raw)
In-Reply-To: <1097239894.2290.13.camel@localhost.localdomain>
On Fri, Oct 08, 2004 at 01:51:36PM +0100, Alan Cox wrote:
> On Gwe, 2004-10-08 at 14:35, Paul Fulghum wrote:
> > It does seem to carry serious overhead (in relation
> > to ring buffers) for devices with small FIFOs.
>
> Thats one reason I wanted sk_buff like rather than sk_buff. I want
> to be able to recycle buffers back to drivers when the driver thinks
> its the right thing to do.
You can have the driver hang on to the sk_buff for several interrupts
until it decides to push the data to the line displine. So even if
the FIFO is small, we only have to allocate/deallocate the skbuff only
but rarely, unless someone really needs low_latency --- which should
be but rarely.
- Ted
next prev parent reply other threads:[~2004-10-08 15:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-07 19:58 [RFC][PATCH] TTY flip buffer SMP changes Paul Fulghum
2004-10-07 19:37 ` Alan Cox
2004-10-08 6:26 ` Theodore Ts'o
2004-10-08 13:35 ` Paul Fulghum
2004-10-08 12:51 ` Alan Cox
2004-10-08 15:00 ` Theodore Ts'o [this message]
2004-10-09 1:42 ` Benjamin Herrenschmidt
2004-10-10 0:32 ` Alan Cox
2004-10-10 3:26 ` Benjamin Herrenschmidt
2004-10-10 12:49 ` Maciej W. Rozycki
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