linux-kernel - Re: [PATCH][V2] nbd: add multi-connection support

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Message-ID: <1af1b85a-6d14-b9b3-69b6-96444fccd187@fb.com>
Date:   Fri, 7 Oct 2016 16:43:10 -0400
From:   Josef Bacik <jbacik@...com>
To:     Pavel Machek <pavel@....cz>
CC:     <axboe@...com>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>,
        <nbd-general@...ts.sourceforge.net>, <w@...r.be>,
        <hch@...radead.org>
Subject: Re: [PATCH][V2] nbd: add multi-connection support

On 10/07/2016 02:36 PM, Pavel Machek wrote:
> On Thu 2016-09-15 10:43:54, Josef Bacik wrote:
>> NBD can become contended on its single connection.  We have to serialize all
>> writes and we can only process one read response at a time.  Fix this by
>> allowing userspace to provide multiple connections to a single nbd device.  This
>> coupled with block-mq drastically increases performance in multi-process cases.
>> Thanks,
>>
>> Signed-off-by: Josef Bacik <jbacik@...com>
>
> Idea is that it can now use multiple CPUs concurrently...?
>
> Do you have a diff for the nbd-server, too?
> 									Pavel
>

nbd-server doesn't need anything special, it just works.  I have a patch for 
nbd-client so you can open multiple connections to setup the NBD device.  You 
can find my patches for the userspace stuff here

https://github.com/josefbacik/nbd

Thanks,

Josef