linux-kernel - Re: NFS: 82ms wakeup latency 4.14-rc4

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Message-ID: <1513616405.7113.18.camel@gmx.de>
Date:   Mon, 18 Dec 2017 18:00:05 +0100
From:   Mike Galbraith <efault@....de>
To:     "J. Bruce Fields" <bfields@...ldses.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Jeff Layton <jlayton@...nel.org>, linux-nfs@...r.kernel.org
Subject: Re: NFS: 82ms wakeup latency 4.14-rc4

On Mon, 2017-12-18 at 11:35 -0500, J. Bruce Fields wrote:
> 
> Like I say, I don't really understand the issues here, so it's more a
> question than an objection....  (I don't know any reason a
> cond_resched() would be bad there.)

Think of it this way: what all can be queued up behind that kworker
that is hogging CPU for huge swaths of time?  It's not only userspace
that suffers.

	-Mike