From: Matthew Hall <mhall@mhcomputing.net> To: dev@dpdk.org Subject: [dpdk-dev] "TX WTHRESH must be set to 0 if tx_rs_thresh is greater than 1" Date: Sat, 18 Oct 2014 15:50:02 -0700 Message-ID: <20141018225002.GA17115@mhcomputing.net> (raw) Hello, I'm just trying to understand what you're supposed to do about this error to get the optiomal configuration / performance. The error message and comments seem like they're designed for Intel ethernet driver hackers not security hackers like myself! ;-) Note: I'm trying out the Intel 82545EM in VirtualBox because the virtio-net approach didn't work, for reasons I enumerated in some previous mails. /* * If rs_bit_thresh is greater than 1, then TX WTHRESH should be * set to 0. If WTHRESH is greater than zero, the RS bit is ignored * by the NIC and all descriptors are written back after the NIC * accumulates WTHRESH descriptors. */ if (tx_conf->tx_thresh.wthresh != 0 && tx_rs_thresh != 1) { RTE_LOG(ERR, PMD, "TX WTHRESH must be set to 0 if " "tx_rs_thresh is greater than 1. (tx_rs_thresh=%u " "port=%d queue=%d)\n", (unsigned int)tx_rs_thresh, (int)dev->data->port_id, (int)queue_idx); return -(EINVAL); } Thanks, Matthew.
next reply other threads:[~2014-10-18 22:42 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-10-18 22:50 Matthew Hall [this message] 2014-10-19 13:46 ` Marc Sune 2014-10-19 17:08 ` Matthew Hall 2014-10-20 9:36 ` Bruce Richardson 2014-10-20 20:29 ` Matthew Hall
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