netdev - Re: [RFC PATCH] virtio_net: Extend virtio to use VF datapath when available

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Message-Id: <20171219.132117.666798483874609477.davem@davemloft.net>
Date:   Tue, 19 Dec 2017 13:21:17 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     stephen@...workplumber.org
Cc:     sridhar.samudrala@...el.com, mst@...hat.com,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        alexander.duyck@...il.com, jesse.brandeburg@...el.com
Subject: Re: [RFC PATCH] virtio_net: Extend virtio to use VF datapath when
 available

From: Stephen Hemminger <stephen@...workplumber.org>
Date: Tue, 19 Dec 2017 09:55:48 -0800

> could be 10ms, just enough to let udev do its renaming

Please, move to some kind of notification or event based handling of
this problem.

No delay is safe, what if userspace gets swapped out or whatever
else might make userspace stall unexpectedly?