netdev - Re: [PATCH v5 2/2] skb

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Date:	Tue, 24 May 2016 14:54:37 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
	Eric Dumazet <eric.dumazet@...il.com>, davem@...emloft.net,
	netdev@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v5 2/2] skb_array: ring test

On Tue, May 24, 2016 at 12:28:09PM +0200, Jesper Dangaard Brouer wrote:
> On Mon, 23 May 2016 23:52:47 +0300
> "Michael S. Tsirkin" <mst@...hat.com> wrote:
> 
> > On Mon, May 23, 2016 at 03:09:18PM +0200, Jesper Dangaard Brouer wrote:
> > > On Mon, 23 May 2016 13:43:46 +0300
> > > "Michael S. Tsirkin" <mst@...hat.com> wrote:
> > >   
> > > > Add ringtest based unit test for skb array.
> > > >
> > > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > > > ---
> > > >  tools/virtio/ringtest/skb_array.c | 167 ++++++++++++++++++++++++++++++++++++++
> > > >  tools/virtio/ringtest/Makefile    |   4 +-  
> > > 
> > > Patch didn't apply cleanly to Makefile, as you also seems to have
> > > "virtio_ring_inorder", I manually applied it.
> > > 
> > > I chdir to tools/virtio/ringtest/ and I could compile "skb_array",
> > > BUT how do I use it??? (the README is not helpful)
> > > 
> > > What is the "output", are there any performance measurement results?  
> > 
> > First, if it completes successfully this means it completed
> > a ton of cycles without errors. It caches any missing barriers
> > which aren't nops on your system.
> 
> I applied these patches on net-next (at commit 07b75260e) and the
> skb_array test program never terminates.   Strangely if I use your git
> tree[1] (on branch vhost) the program does terminate... I didn't spot
> the difference.

Oh, that's my bad. You need

    ringtest: pass buf != NULL
    
    just a stub pointer for now.
    
    Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

from my tree.

-- 
MST