linux-kernel - Re: [PATCH V2 net] Revert "vhost: cache used event for better performance"

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Message-Id: <20170729.141613.128128727353289484.davem@davemloft.net>
Date:   Sat, 29 Jul 2017 14:16:13 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 net] Revert "vhost: cache used event for better
 performance"

From: Jason Wang <jasowang@...hat.com>
Date: Thu, 27 Jul 2017 11:22:05 +0800

> This reverts commit 809ecb9bca6a9424ccd392d67e368160f8b76c92. Since it
> was reported to break vhost_net. We want to cache used event and use
> it to check for notification. The assumption was that guest won't move
> the event idx back, but this could happen in fact when 16 bit index
> wraps around after 64K entries.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied, thanks.