[ClusterLabs] Antw: Re: Antw: Re: [Cluster-devel] DLM connection channel switch take too long time (> 5mins)
gqjiang at suse.com
Tue Mar 13 03:42:57 EDT 2018
On 03/13/2018 03:09 PM, Ulrich Windl wrote:
>>>> Guoqing Jiang <gqjiang at suse.com> schrieb am 13.03.2018 um 05:00 in Nachricht
> <87a8e0e7-63f3-2329-6598-1fa80b1b12d5 at suse.com>:
>> On 03/08/2018 07:24 PM, Ulrich Windl wrote:
>>> What surprises me most is that a connect(...O_NONBLOCK) actually blocks:
>>> The socket is non-blocking and the connection cannot be
>>> pleted immediately.
>> Maybe it is because that the socket is created by sock_create_kern, and
>> O_NONBLOCK flag is not worked since __sctp_connect has the following
>> /* in-kernel sockets don't generally have a file allocated to them
>> * if all they do is call sock_create_kern().
>> if (sk->sk_socket->file)
>> f_flags = sk->sk_socket->file->f_flags;
>> timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
> But O_NONBLOCK is still passed to sock_sndtimeo() (unless the intention was "f_flags & ~O_NONBLOCK").
If I am not reading wrong, the O_NONBLOCK doesn't have effective above
since f_flags is still 0.
So, in this case, timeo is set to sk->sk_sndtimeo. In sctp_wait_for_connect
you also can see nonblock is only work when timeo is set to 0.
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