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Date: Tue, 23 Feb 2010 09:31:32 -0800 From: Sridhar Samudrala <sri@...ibm.com> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org> Subject: Re: [PATCH net-next-2.6] vhost: Restart tx poll when socket send queue is full On Tue, 2010-02-23 at 12:24 +0200, Michael S. Tsirkin wrote: > On Thu, Feb 18, 2010 at 12:59:11PM -0800, Sridhar Samudrala wrote: > > When running guest to remote host TCP stream test using vhost-net > > via tap/macvtap, i am seeing network transmit hangs. This happens > > when handle_tx() returns because of the socket send queue full > > condition. > > This patch fixes this by restarting tx poll when hitting this > > condition. > > > > Signed-off-by: Sridhar Samudrala <sri@...ibm.com> > > > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > > index 91a324c..82d4bbe 100644 > > --- a/drivers/vhost/net.c > > +++ b/drivers/vhost/net.c > > @@ -113,12 +113,16 @@ static void handle_tx(struct vhost_net *net) > > if (!sock) > > return; > > > > - wmem = atomic_read(&sock->sk->sk_wmem_alloc); > > - if (wmem >= sock->sk->sk_sndbuf) > > - return; > > - > > use_mm(net->dev.mm); > > mutex_lock(&vq->mutex); > > + > > + wmem = atomic_read(&sock->sk->sk_wmem_alloc); > > + if (wmem >= sock->sk->sk_sndbuf) { > > + tx_poll_start(net, sock); > > + set_bit(SOCK_ASYNC_NOSPACE, &sock->flags); > > + goto unlock; > > + } > > + > > vhost_disable_notify(vq); > > > > if (wmem < sock->sk->sk_sndbuf * 2) > > @@ -178,6 +182,7 @@ static void handle_tx(struct vhost_net *net) > > } > > } > > > > +unlock: > > mutex_unlock(&vq->mutex); > > unuse_mm(net->dev.mm); > > } > > > It might be better to avoid use_mm when ring is full. > Does the following fix the tx hang for you? Yes. this fixes the tx hang. Thanks Sridhar > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 4c89283..f5f6efe 100644 > --- a/drivers/vhost/net.c > +++ b/drivers/vhost/net.c > @@ -113,8 +113,12 @@ static void handle_tx(struct vhost_net *net) > return; > > wmem = atomic_read(&sock->sk->sk_wmem_alloc); > - if (wmem >= sock->sk->sk_sndbuf) > - return; > + if (wmem >= sock->sk->sk_sndbuf) { > + mutex_lock(&vq->mutex); > + tx_poll_start(net, sock); > + mutex_unlock(&vq->mutex); > + return; > + } > > use_mm(net->dev.mm); > mutex_lock(&vq->mutex); > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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