From: Jakub Kicinski <kuba@kernel.org>
To: Longjun Tang <lange_tang@163.com>
Cc: mst@redhat.com, eperezma@redhat.com, jasowangio@gmail.com,
xuanzhuo@linux.alibaba.com, virtualization@lists.linux.dev,
netdev@vger.kernel.org, tanglongjun@kylinos.cn
Subject: Re: [PATCH 2/3] virtio_net: introduce an RX queue watchdog for stuck detection
Date: Thu, 12 Nov 2026 08:53:33 -0800 [thread overview]
Message-ID: <20261112085333.77476864@kernel.org> (raw)
In-Reply-To: <20261109094310.103979-3-lange_tang@163.com>
On Mon, 9 Nov 2026 17:43:09 +0800 Longjun Tang wrote:
> The backend raises an interrupt after adding buffers to the used ring,
> and the hypervisor injects it. If one is lost (e.g., a transient KVM
> failure), NAPI will not be scheduled and the driver stops consuming
> buffers. The ring eventually fills up, the backend stops notifying, and
> the queue is left permanently stuck.
Can you say more about what platform you're hitting this problem on?
An what's the virtio backend?
next prev parent reply other threads:[~2026-11-12 16:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-09 9:43 [PATCH 0/3] virtio_net: introduce an RX queue watchdog for stuck detection Longjun Tang
2026-11-09 9:43 ` [PATCH 1/3] virtio: add virtqueue_get_last_used_idx() helper Longjun Tang
2026-11-12 16:51 ` Jakub Kicinski
2026-11-09 9:43 ` [PATCH 2/3] virtio_net: introduce an RX queue watchdog for stuck detection Longjun Tang
2026-11-12 16:53 ` Jakub Kicinski [this message]
2026-11-09 9:43 ` [PATCH 3/3] virtio_net: add rx_timeouts per-queue statistic Longjun Tang
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