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From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	'Doug Ledford' <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	'Ram Amrani' <Ram.Amrani-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>,
	'Ira Weiny' <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	'Benjamin Drung'
	<benjamin.drung-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>,
	'Jarod Wilson' <jarod-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Chien Tin Tung
	<chien.tin.tung-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	mustafa.ismail-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH rdma-core 0/5] Common systemd/udev based boot support
Date: Fri, 28 Jul 2017 09:58:42 -0600	[thread overview]
Message-ID: <20170728155842.GC9646@obsidianresearch.com> (raw)
In-Reply-To: <000d01d307a8$9cc0d660$d6428320$@opengridcomputing.com>

On Fri, Jul 28, 2017 at 08:51:28AM -0500, Steve Wise wrote:

> Bringing down the NIC interfaces doesn't totally stop the adapter nor destroy
> the queues needed for RDMA.  It does bring the links down on the ethernet
> interfaces though. So it behaves like I thought.   I tested this by running an
> rping, and while it was pushing rdma traffic, I did 'ifconfig ethX 0.0.0.0 down'
> on the interface in use.  The data flow stopped (and the iWARP/TCP stack started
> retransmitting).  I then brought the link back up, and after a few seconds the
> rping traffic continued on. 

So, why defer creating queues until the first ifup?

I can understand a nic driver that frees all memory when down (that is
fairly common), but this arrangement seems really strange..

Jason
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  reply	other threads:[~2017-07-28 15:58 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-24 20:44 [PATCH rdma-core 0/5] Common systemd/udev based boot support Jason Gunthorpe
     [not found] ` <1500929067-1583-1-git-send-email-jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-24 20:44   ` [PATCH rdma-core 1/5] Common infrastructure for auto loading rdma modules Jason Gunthorpe
     [not found]     ` <1500929067-1583-2-git-send-email-jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-25 17:15       ` Bart Van Assche
     [not found]         ` <1501002916.8931.4.camel-Sjgp3cTcYWE@public.gmane.org>
2017-07-25 17:39           ` Jason Gunthorpe
     [not found]             ` <20170725173947.GA10905-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-27 22:18               ` Jason Gunthorpe
     [not found]                 ` <20170727221850.GB16986-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-27 22:28                   ` Bart Van Assche
     [not found]                     ` <1501194538.2516.10.camel-Sjgp3cTcYWE@public.gmane.org>
2017-07-27 22:38                       ` Jason Gunthorpe
2017-07-26 13:48       ` Dennis Dalessandro
     [not found]         ` <0b3badf8-053f-e1ed-2be8-c5e6d416384b-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-07-26 16:04           ` Jason Gunthorpe
2017-07-24 20:44   ` [PATCH rdma-core 2/5] srp: Autoload the SRP kernel module if required Jason Gunthorpe
2017-07-24 20:44   ` [PATCH rdma-core 3/5] iwpmd: Autoload iwpmd " Jason Gunthorpe
2017-07-24 20:44   ` [PATCH rdma-core 4/5] redhat: Remove cxgb3/4.modprobe files Jason Gunthorpe
2017-07-24 20:44   ` [PATCH rdma-core 5/5] Move umad udev rules to rdma-core Jason Gunthorpe
2017-07-25 16:27   ` [PATCH rdma-core 0/5] Common systemd/udev based boot support Steve Wise
2017-07-25 16:40     ` Jason Gunthorpe
     [not found]       ` <20170725164004.GA20959-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-25 16:43         ` Steve Wise
2017-07-25 16:55           ` Jason Gunthorpe
2017-07-25 18:49         ` Steve Wise
2017-07-25 21:33           ` Jason Gunthorpe
     [not found]             ` <20170725213354.GE10905-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-25 21:52               ` Steve Wise
2017-07-25 22:02                 ` Jason Gunthorpe
     [not found]                   ` <20170725220210.GA15663-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-26 14:05                     ` Steve Wise
2017-07-26 16:24                       ` Jason Gunthorpe
     [not found]                         ` <20170726162419.GC20499-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-26 16:29                           ` Steve Wise
2017-07-28 13:51                         ` Steve Wise
2017-07-28 15:58                           ` Jason Gunthorpe [this message]
     [not found]                             ` <20170728155842.GC9646-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-28 16:08                               ` Steve Wise
2017-07-25 17:01       ` Steve Wise
2017-07-25 17:05         ` Jason Gunthorpe
     [not found]           ` <20170725170506.GB3164-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-07-25 17:08             ` Steve Wise
2017-07-25 18:55       ` Steve Wise
2017-07-27  7:47   ` Amrani, Ram
     [not found]     ` <BN3PR07MB257807A6AE85B9B5575AAD7AF8BE0-EldUQEzkDQfpW3VS/XPqkOFPX92sqiQdvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2017-07-27 16:36       ` Jason Gunthorpe

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