linux-kernel - Re: [PATCH net-next 0/9] TX used ring batched updating for vhost

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Message-ID: <20180722173622-mutt-send-email-mst@kernel.org>
Date:   Sun, 22 Jul 2018 17:37:05 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     netdev@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/9] TX used ring batched updating for vhost

On Fri, Jul 20, 2018 at 08:15:12AM +0800, Jason Wang wrote:
> Hi:
> 
> This series implement batch updating of used ring for TX. This help to
> reduce the cache contention on used ring. The idea is first split
> datacopy path from zerocopy, and do only batching for datacopy. This
> is because zercopy had already supported its own batching.
> 
> TX PPS was increased 25.8% and Netperf TCP does not show obvious
> differences.
> 
> The split of datapath will also be helpful for future implementation
> like in order completion.
> 
> Please review.
> 
> Thanks

Acked-by: Michael S. Tsirkin <mst@...hat.com>

I'm very happy with the split, the mixed data path became hard to
maintain.

> Jason Wang (9):
>   vhost_net: drop unnecessary parameter
>   vhost_net: introduce helper to initialize tx iov iter
>   vhost_net: introduce vhost_exceeds_weight()
>   vhost_net: introduce get_tx_bufs()
>   vhost_net: introduce tx_can_batch()
>   vhost_net: split out datacopy logic
>   vhost_net: rename vhost_rx_signal_used() to vhost_net_signal_used()
>   vhost_net: rename VHOST_RX_BATCH to VHOST_NET_BATCH
>   vhost_net: batch update used ring for datacopy TX
> 
>  drivers/vhost/net.c | 249 +++++++++++++++++++++++++++++++++++++---------------
>  1 file changed, 179 insertions(+), 70 deletions(-)
> 
> -- 
> 2.7.4