Date: Thu, 12 Oct 2006 10:59:10 +0200 From: Danny Braniss <danny@cs.huji.ac.il> To: "Jack Vogel" <jfvogel@gmail.com> Cc: freebsd-hackers@freebsd.org, freebsd-net@freebsd.org Subject: Re: em blues Message-ID: <E1GXwPG-000Op9-VV@cs1.cs.huji.ac.il> In-Reply-To: <2a41acea0610111051r36ad7200gef868593e34c9331@mail.gmail.com> References: <E1GXeiv-0007hw-4u@cs1.cs.huji.ac.il> <2a41acea0610111051r36ad7200gef868593e34c9331@mail.gmail.com>
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> On 10/11/06, Danny Braniss <danny@cs.huji.ac.il> wrote: > > the box is a bit old (Intel Pentium III (933.07-MHz 686-class CPU) > > dual cpu. > > > > running iperf -c (receiving): > > > > freebsd-4.10 0.0-10.0 sec 936 MBytes 785 Mbits/sec > > freebsd-5.4 0.0-10.0 sec 413 MBytes 346 Mbits/sec > > freebsd.6.1 0.0-10.0 sec 366 MBytes 307 Mbits/sec > > freebsd-6.2 0.0-10.0 sec 344 MBytes 289 Mbits/sec > > > > btw, iperf -s (xmitting) is slightly better > > freebsd-4.10 0.0-10.0 sec 664 MBytes 558 Mbits/sec > > freebsd-5.4 0.0-10.0 sec 390 MBytes 327 Mbits/sec > > freebsd-6.1 0.0-10.0 sec 495 MBytes 415 Mbits/sec > > freebsd-6.2 0.0-10.0 sec 487 MBytes 408 Mbits/sec > > > > so, it seems that as the release number increases, the em > > throughput gets worse - or iperf is. > > You arent measuring em, you're measuring RELEASES on > your hardware, is this a surprise on a P3, no. > I agree 100% with your first statement, but, if_em is useless without the rest, and if it's not delivering, then something is wrong somewhere, no necesarely with the em driver, but in how the system interacts. > I still do 930ish Mb/s on a P4 with a PCI-E or PCI-X adaptors > running 6.1, in fact can do that with a 4 port adaptor I believe. i do get on certain combinations nice numbers: Server listening on TCP port 5001 TCP window size: 64.0 KByte (default) ------------------------------------------------------------ [ 4] 0.0-10.0 sec 1.08 GBytes 928 Mbits/sec (the mb is Intel SWV). which seems almost optimal, but on other platforms i get [ 3] 0.0-10.0 sec 654 MBytes 548 Mbits/sec (the mb is Intel SE7501) cheers, danny
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