[dpdk-users] dpdk packet loss,delay, retransmission
anupamalaxmi4 at gmail.com
Sun Jul 21 11:41:34 CEST 2019
I see delay in TCP packet transfer while transferring huge files using
SSH/SCP. The delay is not seen with file sizes up to 35 MB. Beyond 35 MB
there is delay due to TCP out of order /retransmission and packet loss. For
file size 762835531 earlier it took 8 seconds for scp transfer now it takes
~~ 4 mins after DPDK upgrade. I suspected Small RX and TX queue size on
NICs which are connected to DPDK is causing packet drops.
1. Increased TX queue and RX queue size as follows.
RTE_TEST_RX_DESC_DEFAULT 128 RTE_TEST_TX_DESC_DEFAULT 512
RTE_TEST_RX_DESC_DEFAULT 4096 RTE_TEST_TX_DESC_DEFAULT 4096
Saw little improvement. The time taken for scp reduced to 2mins and 30
seconds for file of size 762835531.
1. Tried to rate limit the TX rate using: rte_eth_set_queue_rate_limit
Not seeing much improvement.
Please suggest ways to configure the mbuf,queue size to optimize the
performance and reduce the delay and drop in packet transfer.
More information about the users