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

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Date:   Wed, 26 Jul 2017 19:56:09 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] Revert "vhost: cache used event for better
 performance"



On 2017年07月26日 18:53, Christian Borntraeger wrote:
> On 07/26/2017 10:03 AM, Jason Wang wrote:
>> 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. We try to valid cached used event by
>> checking whether or not it was ahead of new, but this is not correct
>> all the time, it could be stale and there's no way to know about this.
>>
>> Signed-off-by: Jason Wang <jasowang@...hat.com>
> This would then qualify for stable ?
>

Yes it is.

Thanks