Hi,
My user-space TCP/IP stack works fine on DPDK 17.02, now I upgrade it to
18.02. And then I use wrk http benchmark to test my stack, it work well fine,
but after a while, it couldn't send packet. I debug with gdb and find the
rte_eth_tx_burst always return 0, which means there is no available transmit
descriptor. And then I enable DPDK debug mode, the ixgbe_xmit_pkts has been
called to send packets (My NIC is Intel 82599ES 10G) and it called
ixgbe_xmit_cleanup to recycle used transmit descriptor, but ixgbe_xmit_cleanup
always return -1. The relevant code is blew.
/* Check to make sure the last descriptor to clean is done */
desc_to_clean_to = sw_ring[desc_to_clean_to].last_id;
status = txr[desc_to_clean_to].wb.status;
if (!(status & rte_cpu_to_le_32(IXGBE_TXD_STAT_DD))) {
PMD_TX_FREE_LOG(DEBUG,
"TX descriptor %4u is not done"
"(port=%d queue=%d)",
desc_to_clean_to,
txq->port_id, txq->queue_id);
/* Failed to clean any descriptors, better luck next time */
return -(1);
}
I'm stuck here, and wonder how DPDK upgrade brings up this issue. Btw, there
was a similar mail which encountered the same issue,
http://mails.dpdk.org/archives/dev/2017-August/073240.html, but I find no final
solution for it.
Thanks a lot for your time, and dying for your reply!
Huiyou
