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SubjectRe: [PATCH net] vhost_net: flush batched heads before trying to busy polling
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From: Jason Wang <jasowang@redhat.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@redhat.com>

Applied and queued up for -stable.

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