linux-kernel - Re: [RFC PATCH 00/14] nfsd/sunrpc: add support for a workqueue-based nfsd

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Message-ID: <20141202192920.GM10918@htj.dyndns.org>
Date:	Tue, 2 Dec 2014 14:29:20 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Jeff Layton <jeff.layton@...marydata.com>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC PATCH 00/14] nfsd/sunrpc: add support for a workqueue-based
 nfsd

Hello, Jeff.

On Tue, Dec 02, 2014 at 02:26:27PM -0500, Jeff Layton wrote:
> I'm already using WQ_UNBOUND workqueues. If that exempts this code from
> the concurrency management, then that's probably not the problem. The
> jobs here aren't terribly CPU intensive, but they can sleep for a long
> time while waiting on I/O, etc...

Yeap, noticed that.  Replied in another message.

> I don't think we necessarily need CPU locality (though that's nice to
> have of course), but NUMA affinity will likely be important. It looked
> like you had done some work a year or so ago to make unbound workqueues
> prefer to queue work on the same NUMA node which meshes nicely with
> what I think we want for this.

Yeap, unbound workqueues are NUMA-affine by default.

Thanks.

-- 
tejun
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