[dpdk-dev] traffic no longer readable...
Thomas Monjalon
thomas.monjalon at 6wind.com
Wed May 20 17:33:20 CEST 2015
2015-05-20 11:11, Jeff Weeks:
> Hello all,
>
> I've been developing with dpdk, using virtio, and I'm noticing that I can
> often get into a state whereby I no longer receive any packets.
>
> The call to rte_eth_rx_burst always returns 0, indicating the rx queue is
> empty.
>
> How is this queue filled? I see there is a dpdk thread, which waits on an
> epoll fd for interrupts. I set a breakpoint here, and it appeared as though
> we were waiting forever on the epoll fd. This, to me, seemed to be the source
> of the issue I'm seeing (presumably interrupts cause us to read off the nic and
> fill the queue?)... but, oddly enough, I see the same behaviour even when I'm
> receiving packets.
>
> Have I misinterpreted how this is supposed to work? Or is gdb behaving poorly
> for me (wouldn't be surprising...).
>
> What/how else can I further investigate this?
Are you using the latest version (git HEAD)?
Are you using DPDK vhost?
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