Testing packet sizes beyond the MTU is pointless unless you use that in a real-world scenario. You are testing a lot more than the ethernet chip and driver, in any event.
What are you testing for? It's not very clear from your original message. Karel Gardas [EMAIL PROTECTED] wrote: > Henning Brauer wrote: > > >* Karel Gardas <[EMAIL PROTECTED]> [2006-05-23 15:55]: > >> So again some jumping around 1400 bytes. > >> > >> The final question is: is this jumping behaviour caused by buggy drivers > >> in both OpenBSD and Linux or is this some kind of hardware behaviour > >which > >> software is not able to workaround? > > > >it is not at 1400, it is somewhere between 1400 and 1500. Given that > >the MTU on ethernet tends to be 1500, this is no surprise - 1500 minus > >headers. Above that you need >1 packets. > > Yes, this is expected, but have you seen the pictures? Why do I get those > numbers: > > Mbps size > 0.000453 26.381993 12528 1566 0.000001 0.000001 0.000071 0.000000 0.000000 > 0.001532 7.823133 12568 1571 0.000000 0.000006 0.000076 0.000000 0.000000 > 0.000450 26.741679 12608 1576 0.000002 0.000003 0.000072 0.000000 0.000000 > 0.001527 7.900714 12648 1581 0.000001 0.000002 0.000081 0.000000 0.000000 > 0.000450 26.898181 12688 1586 0.000008 0.000000 0.000089 0.000000 0.000000 > 0.001971 6.157954 12728 1591 0.000002 0.000000 0.000080 0.000000 0.000000 > 0.000450 27.029827 12768 1596 0.000007 0.000000 0.000084 0.000000 0.000000 > 0.000450 27.160984 12808 1601 0.000000 0.000000 0.000094 0.000000 0.000000 > ... > 0.000453 30.092254 14288 1786 0.000036 0.000000 0.000041 0.000000 0.000000 > 0.001536 8.893703 14328 1791 0.000008 0.000005 0.000084 0.000000 0.000000 > 0.004117 3.328115 14368 1796 0.000042 0.000000 0.000055 0.000000 0.000000 > 0.000455 30.203472 14408 1801 0.000235 0.000009 0.000102 0.000000 0.000000 > 0.012522 1.100382 14448 1806 0.000005 0.000003 0.000081 0.000000 0.000000 > 0.000453 30.507813 14488 1811 0.001304 0.000000 0.000029 0.000000 0.000000 > 0.005221 2.653563 14528 1816 0.000015 0.000001 0.000077 0.000000 0.000000 > 0.000456 30.487335 14568 1821 0.000256 0.000012 0.000095 0.000000 0.000000 > 0.001547 9.003794 14608 1826 0.000055 0.000004 0.000071 0.000000 0.000000 > 0.000456 30.650126 14648 1831 0.000123 0.000003 0.000087 0.000000 0.000000 > 0.010510 1.332744 14688 1836 0.000010 0.000001 0.000087 0.000000 0.000000 > 0.000459 30.587747 14728 1841 0.000575 0.000000 0.000121 0.000000 0.000000 > > I'm not against the fact that message of size 1806 bytes need to be > transfered in 2 ethernet packets, the problem is why I get 1.1Mbps > throughput with this size and get ~30Mbps with messages of 1801 and 1811 > bytes? That's the reason why I'm asking if it is driver or hardware bug. > Note that numbers above are copied from the test where sk(4) was driven by > OpenBSD3.9-current. > > Thanks, > Karel > -- > Karel Gardas [EMAIL PROTECTED] > ObjectSecurity Ltd. http://www.objectsecurity.com -- There is no certainty, there is only opportunity
