[ovs-dev] [PATCH] fix ovsdb-server memory growth issues when ovs-vsctl cmd stucking.

[zengganghui]

We have found a patch (http://patchwork.ozlabs.org/patch/593753/) can resolve this problem.

BR.
Zeng Ganghui
Huawei Technologies Co., Ltd.

-----Original Message-----
From: zengganghui 
Sent: Monday, August 28, 2017 11:15 AM
To: 'Ben Pfaff'
Cc: dev at openvswitch.org
Subject: RE: [PATCH] fix ovsdb-server memory growth issues when ovs-vsctl cmd stucking.

In our environment when applied this patch can solve this problem. For the root cause we are still analyzing, can you help us?
Through our analysis, we suspect that when the ovs-vsctl cmd (ex: ovs-vsctl list interface) sticking, but unix socket link still exists. At this time if the ovsdb data updated, it will continue to send the updated data to ovs-vsctl. Resulting in continuous allocate rpc, but these rpcs cannot be released.

BR.
Zeng Ganghui
Huawei Technologies Co., Ltd.

-----Original Message-----
From: Ben Pfaff [mailto:blp at ovn.org] 
Sent: Sunday, August 27, 2017 6:33 AM
To: zengganghui
Cc: dev at openvswitch.org
Subject: Re: [PATCH] fix ovsdb-server memory growth issues when ovs-vsctl cmd stucking.

On Sat, Aug 26, 2017 at 07:44:53PM +0800, ZengGanghui wrote:
> When rpc sends message failed with return EAGIN, it will try to send again unlimitly.
> Finally, the memory of ovsdb-server will grow infinitly.
> 
> Signed-off-by: ZengGanghui <zengganghui at huawei.com>

This patch doesn't make sense to me.  A failed stream send should not use memory.  Can you explain the problem and why this solves it?