linux-kernel - Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling

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Message-ID: <20110602171721.GA13215@redhat.com>
Date:	Thu, 2 Jun 2011 20:17:21 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Shirley Ma <xma@...ibm.com>, lguest@...ts.ozlabs.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org, kvm@...r.kernel.org,
	Krishna Kumar <krkumar2@...ibm.com>,
	Tom Lendacky <tahm@...ux.vnet.ibm.com>, steved@...ibm.com,
	habanero@...ux.vnet.ibm.com
Subject: Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling

On Thu, Jun 02, 2011 at 06:42:35PM +0300, Michael S. Tsirkin wrote:
> OK, here's a new attempt to use the new capacity api.  I also added more
> comments to clarify the logic.  Hope this is more readable.  Let me know
> pls.
> 
> This is on top of the patches applied by Rusty.
> 
> Warning: untested. Posting now to give people chance to
> comment on the API.
> 
> Changes from v1:
> - fix comment in patch 2 to correct confusion noted by Rusty
> - rewrite patch 3 along the lines suggested by Rusty
>   note: it's not exactly the same but I hope it's close
>   enough, the main difference is that mine does limited
>   polling even in the unlikely xmit failure case.
> - added a patch to not return capacity from add_buf
>   it always looked like a weird hack
> 
> Michael S. Tsirkin (4):
>   virtio_ring: add capacity check API
>   virtio_net: fix tx capacity checks using new API
>   virtio_net: limit xmit polling
>   Revert "virtio: make add_buf return capacity remaining:
> 
>  drivers/net/virtio_net.c     |  111 ++++++++++++++++++++++++++----------------
>  drivers/virtio/virtio_ring.c |   10 +++-
>  include/linux/virtio.h       |    7 ++-
>  3 files changed, 84 insertions(+), 44 deletions(-)
> 
> -- 
> 1.7.5.53.gc233e


And just FYI, here's a patch (on top) that I considered but
decided against. This does a single get_buf before
xmit. I thought it's not really needed as the capacity
check in add_buf is relatively cheap, and we removed
the kick in xmit_skb. But the point is that the loop
will now be easy to move around if someone manages
to show this benefits speed (which I doubt).

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index b25db1c..75af5be 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -590,6 +590,9 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct virtnet_info *vi = netdev_priv(dev);
 	int ret, i;
 
+	/* Try to pop an skb, to increase the chance we can add this one. */
+	free_old_xmit_skb(v);
+
 	/* We normally do have space in the ring, so try to queue the skb as
 	 * fast as possible. */
 	ret = xmit_skb(vi, skb);
@@ -627,8 +630,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
 	 * This is so that we don't hog the skb memory unnecessarily. *
 	 * Doing this after kick means there's a chance we'll free
 	 * the skb we have just sent, which is hot in cache. */
-	for (i = 0; i < 2; i++)
-		free_old_xmit_skb(v);
+	free_old_xmit_skb(v);
 
 	if (likely(free_xmit_capacity(vi)))
 		return NETDEV_TX_OK;
--
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