linux-kernel - Re: [PATCH net-next V4 0/6] switch to use tx skb array in tun

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Message-ID: <577607D1.9070307@redhat.com>
Date:	Fri, 1 Jul 2016 14:04:01 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	davem@...emloft.net, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, eric.dumazet@...il.com,
	brouer@...hat.com
Subject: Re: [PATCH net-next V4 0/6] switch to use tx skb array in tun



On 2016年06月30日 23:45, Michael S. Tsirkin wrote:
> On Thu, Jun 30, 2016 at 02:45:30PM +0800, Jason Wang wrote:
>> >Hi all:
>> >
>> >This series tries to switch to use skb array in tun. This is used to
>> >eliminate the spinlock contention between producer and consumer. The
>> >conversion was straightforward: just introdce a tx skb array and use
>> >it instead of sk_receive_queue.
>> >
>> >A minor issue is to keep the tx_queue_len behaviour, since tun used to
>> >use it for the length of sk_receive_queue. This is done through:
>> >
>> >- add the ability to resize multiple rings at once to avoid handling
>> >   partial resize failure for mutiple rings.
>> >- add the support for zero length ring.
>> >- introduce a notifier which was triggered when tx_queue_len was
>> >   changed for a netdev.
>> >- resize all queues during the tx_queue_len changing.
>> >
>> >Tests shows about 15% improvement on guest rx pps:
>> >
>> >Before: ~1300000pps
>> >After : ~1500000pps
> Acked-by: Michael S. Tsirkin<mst@...hat.com>
>
> Acked-from-altitude: 34697 feet.

Wow, thanks a lot!