netdev - Re: [PATCH net] vhost_net: flush batched heads before trying to busy polling

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Message-Id: <20180530.133104.1841137099094945800.davem@davemloft.net>
Date:   Wed, 30 May 2018 13:31:04 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] vhost_net: flush batched heads before trying to
 busy polling

From: Jason Wang <jasowang@...hat.com>
Date: Tue, 29 May 2018 14:18:19 +0800

> After commit e2b3b35eb989 ("vhost_net: batch used ring update in rx"),
> we tend to batch updating used heads. But it doesn't flush batched
> heads before trying to do busy polling, this will cause vhost to wait
> for guest TX which waits for the used RX. Fixing by flush batched
> heads before busy loop.
> 
> 1 byte TCP_RR performance recovers from 13107.83 to 50402.65.
> 
> Fixes: e2b3b35eb989 ("vhost_net: batch used ring update in rx")
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied and queued up for -stable.