linux-kernel - Re: [PATCH] dlm: prompt the user SCTP is experimental

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Date:   Mon, 02 Apr 2018 20:01:24 -0600
From:   "Gang He" <ghe@...e.com>
To:     <teigland@...hat.com>
Cc:     <cluster-devel@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dlm: prompt the user SCTP is experimental

Hi David,



>>> 
> On Thu, Mar 22, 2018 at 10:27:56PM -0600, Gang He wrote:
>> Hello David,
>> 
>> Do you agree to add this prompt to the user? 
>> Since sometimes customers attempted to setup SCTP protocol with two rings, 
>> but they could not get the expected result, then it maybe bring some 
> concerns to the customer for DLM qualities.
> 
> I don't think the kernel message is a good way to communicate this to users.
> Dave
OK, I got your point.
But, could we have a appropriate way to let the users know SCTP protocol status?

Thanks
Gang

> 
> 
>> > As you know, DLM module can use TCP or SCTP protocols to
>> > communicate among the cluster.
>> > But, according to our testing, SCTP protocol is still considered
>> > experimental, since not all aspects are working correctly and
>> > it is not full tested.
>> > e.g. SCTP connection channel switch needs about 5mins hang in case
>> > one connection(ring) is broken.
>> > Then, I suggest to add a kernel print, which prompts the user SCTP
>> > protocol for DLM should be considered experimental, it is not
>> > recommended in production environment.
>> > 
>> > Signed-off-by: Gang He <ghe@...e.com>
>> > ---
>> >  fs/dlm/lowcomms.c | 1 +
>> >  1 file changed, 1 insertion(+)
>> > 
>> > diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
>> > index cff79ea..18fd85d 100644
>> > --- a/fs/dlm/lowcomms.c
>> > +++ b/fs/dlm/lowcomms.c
>> > @@ -1307,6 +1307,7 @@ static int sctp_listen_for_all(void)
>> >  		return -ENOMEM;
>> >  
>> >  	log_print("Using SCTP for communications");
>> > +	log_print("SCTP protocol is experimental, use at your own risk");
>> >  
>> >  	result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
>> >  				  SOCK_STREAM, IPPROTO_SCTP, &sock);
>> > -- 
>> > 1.8.5.6