From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Hall <mhall-Hv3ogNYU3JfZZajBQzqCxQ@public.gmane.org>
Subject: Re: "TX WTHRESH must be set to 0 if tx_rs_thresh is
	greater than 1"
Date: Sun, 19 Oct 2014 10:08:29 -0700
Message-ID: <5809CF89-13EB-4698-B4B4-AFD41897DD33@mhcomputing.net>
References: <20141018225002.GA17115@mhcomputing.net>
 <5443C0B3.6060805@bisdn.de>
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To: Marc Sune <marc.sune-kpkqNMk1I7M@public.gmane.org>,dev-VfR2kkLFssw@public.gmane.org
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1.7.1 with a few minor clang compatibility patches in the example apps
--=20
Sent from my mobile device.

On October 19, 2014 6:46:27 AM PDT, Marc Sune <marc.sune-kpkqNMk1I7M@public.gmane.org> wrote:
>Which DPDK version are you using
>
>marc
>
>On 19/10/14 00:50, Matthew Hall wrote:
>> 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 !=3D 0 && tx_rs_thresh !=3D 1) {
>>          RTE_LOG(ERR, PMD, "TX WTHRESH must be set to 0 if "
>>              "tx_rs_thresh is greater than 1. (tx_rs_thresh=3D%u "
>>              "port=3D%d queue=3D%d)\n", (unsigned int)tx_rs_thresh,
>>                  (int)dev->data->port_id, (int)queue_idx);
>>          return -(EINVAL);
>>      }
>>
>> Thanks,
>> Matthew.