Date: Fri, 25 May 2012 09:27:42 -0400 From: Andrew Gallatin <gallatin@cs.duke.edu> To: freebsd-net@freebsd.org Cc: Andrew Gallatin <gallatin@myri.com> Subject: Re: Major performance hit with ToS setting Message-ID: <4FBF88CE.20209@cs.duke.edu> In-Reply-To: <CAN6yY1sLxFJ18ANO7nQqLetnJiT-K6pHC-X3yT1dWuWGa0VLUg@mail.gmail.com> References: <CAN6yY1sLxFJ18ANO7nQqLetnJiT-K6pHC-X3yT1dWuWGa0VLUg@mail.gmail.com>
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On 05/24/12 18:55, Kevin Oberman wrote: > > This is,of course, on a 10G interface. On 7.3 there is little Hi Kevin, What you're seeing looks almost like a checksum is bad, or there is some other packet damage. Do you see any error counters increasing if you run netstat -s before and after the test & compare the results? Thinking that, perhaps, this was a bug in my mxge(4), I attempted to reproduce it this morning between 8.3 and 9.0 boxes and failed to see the bad behavior.. % nuttcp-6.1.2 -c32t -t diablo1-m < /dev/zero 9161.7500 MB / 10.21 sec = 7526.5792 Mbps 53 %TX 97 %RX 0 host-retrans 0.11 msRTT % nuttcp-6.1.2 -t diablo1-m < /dev/zero 9140.6180 MB / 10.21 sec = 7509.8270 Mbps 53 %TX 97 %RX 0 host-retrans 0.11 msRTT However, I don't have any 8.2-r box handy, so I cannot exactly repro your experiment... Drew
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