netdev - Re: [patch 0/6] s390: qeth fixes for 2.6.30

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Date:	Wed, 25 Mar 2009 16:47:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	blaschka@...ux.vnet.ibm.com
Cc:	netdev@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [patch 0/6] s390: qeth fixes for 2.6.30

From: Frank Blaschka <blaschka@...ux.vnet.ibm.com>
Date: Wed, 25 Mar 2009 09:25:14 +0100

> > Your EDDP was slow because the implementation was incredibly
> > sub-optimal.  %90 of the code is doing copies and fiddling
> > with SKB internals.
> 
> I did not wrote the EDDP code but this was my impression too. Thanks for
> confirming my study. Also the filling of the hardware buffers was not
> efficient and passing more buffers to the hw was expensive too.

I keep meaning to get back to a project I was working on that
would make generic the by-hand TSO that drivers such as
drivers/net/sfc/ are doing.

Just like this EDDP code seems to have been doing, they claim
to be TSO capable as a device but it is all done in software.

The hope is to write a generic framework, and skb_dma_map() and
skb_dma_unmap() were created as initial infrastructure for that.

Anyways, if I ever complete that project, drivers like qeth
could try to make use of it and do some perf tests.
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