netdev - Re: [PATCH] sky2: skb recycling

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Message-ID: <20081022170517.051d766f@extreme>
Date:	Wed, 22 Oct 2008 17:05:17 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>, jgarzik@...ox.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: skb recycling

On Wed, 22 Oct 2008 16:58:17 -0700
Rick Jones <rick.jones2@...com> wrote:

> Stephen Hemminger wrote:
> > On Tue, 21 Oct 2008 22:15:43 +0200
> > Eric Dumazet <dada1@...mosbay.com> wrote:
> > 
> > 
> >>Rick Jones a écrit :
> >>> I've not had a good emily litella moment all day so I'll ask - is
> >>> there really that much in the way of suitable skb's which are
> >>> completely free after transmit completion?
> >>
> >> Or, if we take another way, say a VOIP RTP machine sends and
> >> receive 20.000 packets per second, each being 200 bytes long, are
> >> transmited packets correctly sized at sendto() time to be
> >> candidates for recycling ?
> > 
> > No. Most locally generate packets aren't going to be right size
> > because they will be too small, cloned or fragmented.  It really only
> > helps when forwarding.
> 
> So we have a bit of "tension" between the desires of an end host vs 
> those of a router right?
> 
> rick jones

Not tension, just means on end host this optimization does nothing.
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