From: Zoltan Kiss <zoltan.kiss@citrix.com>
To: Wei Liu <wei.liu2@citrix.com>
Cc: <ian.campbell@citrix.com>, <xen-devel@lists.xenproject.org>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<jonathan.davies@citrix.com>, David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next v2] xen-netback: Rework rx_work_todo
Date: Tue, 4 Feb 2014 19:55:42 +0000 [thread overview]
Message-ID: <52F145BE.3090606@citrix.com> (raw)
In-Reply-To: <52F13D24.5090405@citrix.com>
On 04/02/14 19:19, Zoltan Kiss wrote:
> On 20/01/14 16:38, Wei Liu wrote:
>> On Wed, Jan 15, 2014 at 05:11:07PM +0000, Zoltan Kiss wrote:
>>> The recent patch to fix receive side flow control (11b57f) solved the
>>> spinning
>>> thread problem, however caused an another one. The receive side can
>>> stall, if:
>>> - [THREAD] xenvif_rx_action sets rx_queue_stopped to true
>>> - [INTERRUPT] interrupt happens, and sets rx_event to true
>>> - [THREAD] then xenvif_kthread sets rx_event to false
>>> - [THREAD] rx_work_todo doesn't return true anymore
>>>
>>> Also, if interrupt sent but there is still no room in the ring, it
>>> take quite a
>>> long time until xenvif_rx_action realize it. This patch ditch that
>>> two variable,
>>> and rework rx_work_todo. If the thread finds it can't fit more skb's
>>> into the
>>> ring, it saves the last slot estimation into rx_last_skb_slots,
>>> otherwise it's
>>> kept as 0. Then rx_work_todo will check if:
>>> - there is something to send to the ring (like before)
>>> - there is space for the topmost packet in the queue
>>>
>>> I think that's more natural and optimal thing to test than two bool
>>> which are
>>> set somewhere else.
>>>
>>> Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
>>
>> Sorry for the delay.
>>
>> Paul, thanks for reviewing.
>>
>> Acked-by: Wei Liu <wei.liu2@citrix.com>
>
> Hi,
>
> This patch haven't made it to net-next yet, maybe because the subject
> doesn't suggest that this is a bugfix. I suggest to apply it as soon as
> possible, otherwise netback will be quite broken.
I've reposted it with clearer subject, sorry for being too vague
Zoli
prev parent reply other threads:[~2014-02-04 19:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 17:11 [PATCH net-next v2] xen-netback: Rework rx_work_todo Zoltan Kiss
2014-01-20 12:23 ` Zoltan Kiss
2014-01-20 13:02 ` Paul Durrant
2014-01-20 16:38 ` Wei Liu
2014-02-04 19:19 ` Zoltan Kiss
2014-02-04 19:55 ` Zoltan Kiss [this message]
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