[dpdk-dev] igb: correctly setting default value TX_WTHRESH (due to performance warning during PMD init)
mhall at mhcomputing.net
Wed Jan 20 07:43:54 CET 2016
I get this error when running DPDK with the IGB driver in pktgen-dpdk
and other code:
PMD: WARNING: eth_igb_tx_queue_setup(): To improve 1G driver
performance, consider setting the TX WTHRESH value to 4, 8, or 16.
Internally, the code is checking "if (tx_conf->tx_thresh.wthresh == 0)".
But, I am confused now because a while ago I thought we made a bunch of
DPDK usability changes to get rid of this headache. I remember reading /
learning that if you set zero for most rx_conf and tx_conf parameters,
the PMD is supposed to auto-select sane default values.
Given that, why are you forced to set TX_WTHRESH by hand for igb?
What sane default value one should pick for this setting?
Could we do something better to auto-select this like we did for most
rx_conf / tx_conf settings previously? Or did I miss something about the
usability changes or do something wrong?
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