* soft-lockups in sunvnet (was Re: [PATCH sparc] ldc_connect() should not return EINVAL when handshake
@ 2014-08-08 18:39 Sowmini Varadhan
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From: Sowmini Varadhan @ 2014-08-08 18:39 UTC (permalink / raw)
To: sparclinux
On (08/08/14 10:33), David Miller wrote:
>
> The problem with not taking the carrier off is that the qdisc layer is
> going to spam messages into the log each time the TX watchdog timer
> goes off.
spamming messages into logs is the lesser of my problems at this point :-)
The tasklet mechanims for kicking of netif_wake_queue works quite
well, and is simple enough to do.
But once I removed the heuristic exponential backoff/retry for
vnet_send_ack(), I'm freqently not able to send any DRING_STOPPED
messages, and that seems to freeze all access even over the switch-port
to the VM (even though, afaict, netif_stop_queue has not been called.
If we can't send the LDC ack from vnet_event, we need to reset
this peer, but vio_conn_reset() is a no-op. Recovering from here
is going to be quite sticky.
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2014-08-08 18:39 soft-lockups in sunvnet (was Re: [PATCH sparc] ldc_connect() should not return EINVAL when handshake Sowmini Varadhan
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