From: Miklos Szeredi <miklos@szeredi.hu>
To: Goswin von Brederlow <goswin-v-b@web.de>
Cc: fuse-devel <fuse-devel@lists.sourceforge.net>,
Ashish Samant <ashish.samant@oracle.com>,
Srinivas Eeda <srinivas.eeda@oracle.com>,
Linux-Fsdevel <linux-fsdevel@vger.kernel.org>,
Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [fuse-devel] fuse scalability part 1
Date: Thu, 24 Sep 2015 08:30:47 +0200 [thread overview]
Message-ID: <CAJfpegtSRy0waV_X-8BZrET0E3JNZK4xkGUSZnabk_6KKRE0Xw@mail.gmail.com> (raw)
In-Reply-To: <20150814101453.GB31364@frosties>
On Fri, Aug 14, 2015 at 12:14 PM, Goswin von Brederlow
<goswin-v-b@web.de> wrote:
> On Mon, May 18, 2015 at 05:13:36PM +0200, Miklos Szeredi wrote:
>> This part splits out an "input queue" and a "processing queue" from the
>> monolithic "fuse connection", each of those having their own spinlock.
>>
>> The end of the patchset adds the ability to "clone" a fuse connection. This
>> means, that instead of having to read/write requests/answers on a single fuse
>> device fd, the fuse daemon can have multiple distinct file descriptors open.
>> Each of those can be used to receive requests and send answers, currently the
>> only constraint is that a request must be answered on the same fd as it was read
>> from.
>>
>> This can be extended further to allow binding a device clone to a specific CPU
>> or NUMA node.
>
> How will requests be distributed across clones?
>
> Is the idea here to start one clone per core and have IO requests
> originating from one core to be processed by the fuse clone on the
> same core? I remember there was a noticeable speedup when request and
> processing where on the same core.
>
> How is the clone for each request choosen? What if there is no clone
> pinned to the same core? Will it pick the clone nearest in NUMA terms?
> Will it round-robin? Will it load balance to the clone with least
> number of requests pending? What if one clone stops processing requests?
Good questions. I guess, first implementation should be the simplest
possible. E.g. use the queue that matches (in this order):
- CPU
- NUMA node
- any (round robin or whatever)
I woudn't worry about load balancing and unresponsive queues until
such issues come up in real life.
Thanks,
Miklos
next prev parent reply other threads:[~2015-09-24 6:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-18 15:13 fuse scalability part 1 Miklos Szeredi
2015-09-24 1:13 ` Ashish Samant
[not found] ` <20150814101453.GB31364@frosties>
2015-09-24 6:30 ` Miklos Szeredi [this message]
2015-09-24 19:17 ` Ashish Samant
2015-09-25 12:11 ` Miklos Szeredi
2015-09-25 17:53 ` Ashish Samant
2015-09-29 6:18 ` Srinivas Eeda
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