From: Wei Liu <wei.liu2@citrix.com>
To: David Vrabel <david.vrabel@citrix.com>
Cc: <netdev@vger.kernel.org>, <xen-devel@lists.xenproject.org>,
Ian Campbell <ian.campbell@citrix.com>,
Wei Liu <wei.liu2@citrix.com>
Subject: Re: [PATCH 3/3] xen-netback: reintroduce guest Rx stall detection
Date: Thu, 23 Oct 2014 12:49:52 +0100 [thread overview]
Message-ID: <20141023114952.GI9188@zion.uk.xensource.com> (raw)
In-Reply-To: <1413983335-8307-4-git-send-email-david.vrabel@citrix.com>
On Wed, Oct 22, 2014 at 02:08:55PM +0100, David Vrabel wrote:
> If a frontend not receiving packets it is useful to detect this and
> turn off the carrier so packets are dropped early instead of being
> queued and drained when they expire.
>
> A to-guest queue is stalled if it doesn't have enough free slots for a
> an extended period of time (default 60 s).
>
> If at least one queue is stalled, the carrier is turned off (in the
> expectation that the other queues will soon stall as well). The
> carrier is only turned on once all queues are ready.
>
> When the frontend connects, all the queues start in the stalled state
> and only become ready once the frontend queues enough Rx requests.
>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
next prev parent reply other threads:[~2014-10-23 11:49 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-22 13:08 [PATCHv1 0/3 net-next] xen-netback: guest Rx queue drain and stall fixes David Vrabel
2014-10-22 13:08 ` [PATCH 1/3] xen-netback: make feature-rx-notify mandatory David Vrabel
2014-10-22 13:08 ` David Vrabel
2014-10-23 11:16 ` Wei Liu
2014-10-23 11:32 ` Wei Liu
2014-10-23 11:32 ` Wei Liu
2014-10-23 11:37 ` David Vrabel
2014-10-23 11:44 ` Wei Liu
2014-10-23 11:44 ` Wei Liu
2014-10-23 11:52 ` David Vrabel
2014-10-23 11:52 ` David Vrabel
2014-10-23 11:37 ` David Vrabel
2014-10-23 11:16 ` Wei Liu
2014-10-22 13:08 ` [PATCH 2/3] xen-netback: fix unlimited guest Rx internal queue and carrier flapping David Vrabel
2014-10-22 13:08 ` David Vrabel
2014-10-23 11:40 ` Wei Liu
2014-10-23 11:40 ` Wei Liu
2014-10-22 13:08 ` [PATCH 3/3] xen-netback: reintroduce guest Rx stall detection David Vrabel
2014-10-22 13:08 ` David Vrabel
2014-10-23 11:49 ` Wei Liu
2014-10-23 11:49 ` Wei Liu [this message]
2014-10-25 18:14 ` [PATCHv1 0/3 net-next] xen-netback: guest Rx queue drain and stall fixes David Miller
2014-10-25 18:17 ` David Miller
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