netdev - Re: small packets sent through ne2k-pci delayed

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Date:	Sun, 4 Apr 2010 10:23:42 -0700 (PDT)
From:	Stephen Hemminger <stephen.hemminger@...tta.com>
To:	Florian Zumbiehl <florz@...rz.de>
Cc:	p gortmaker <p_gortmaker@...oo.com>, netdev@...r.kernel.org
Subject: Re: small packets sent through ne2k-pci delayed


----- "Florian Zumbiehl" <florz@...rz.de> wrote:

> Hi,
> 
> I noticed today that a 2.6.33 kernel with an ne2k-pci card of mine
> transmits small packets (those that result in frames < 61 bytes)
> only with some major delay - or more exactly, it seems that they are
> being transmitted only when the next packet to be transmitted comes
> along.
> 
> Now, this patch seems to fix it for me, but I am not that sure that
> that's
> how it should be fixed:
> 
> di

> I _think_ that this problem did not exist with 2.6.22-rc4 - but I
> didn't
> have a chance to (re-)test that yet, I just think that I did things in
> the
> past (when that kernel was still running on that machine) that would
> imply
> that the problem did not exist at the time ...
> 
> So, any suggestions what I should try, other than re-testing with
> 2.6.22-rc4 (some time soon, I can do that, too, just not now)?
> 
> What might be interesting to know: those 61-byte frames do actually
> arrive
> at the recipient as 61-byte frames ...
> 
> Florian
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The standard correct way to do this is skb_padto()
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