Date: Wed, 13 Jun 2001 13:36:41 -0400 From: "Robin P. Blanchard" <Robin_Blanchard@gactr.uga.edu> To: stable@freebsd.org Subject: Re: gigabit woes Message-ID: <3B27A4A9.8451D824@gactr.uga.edu> References: <3B2647E0.E40A2339@gactr.uga.edu> <20010612190345.A20019@skriver.dk> <3B265155.ACE63DEF@gactr.uga.edu> <3B2791A8.8CB334E@gactr.uga.edu>
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yet more findings: entirely removed the intel 100Mb nic as well as the 3com 1000Mb nic. installed a 3com 100Mb nic (device xl); edited my kernel appropriately, removed my old kernel build-tree, rebuilt the kernel and rebooted. same test, still at 2.67 MB/s. both ends are showing no errors whatsoever and are both reporting connection as 100MB full-duplex. this is becoming more and more bizarre. input is appreciated. > new findings on this problem... > > so i decided to try the card(s) (3com and intel) in another, older > dell poweredge 4300. before installing the card, i wanted to test > the performance on the already installed 100Mb intel card (fxp). > using the same test, i was getting around 10.3MB/s. that done, i > reconfigured the kernel to support the ti device, disabled > the fxp ifconfig entry in rc.conf, enabling ti instead, shut > the box down, installed the card and rebooted. i ran the same > test again (now using the gig interface) and wound up with a whopping > 2.67 MB/s. everything looks fine at the switch, and freebsd is not > complaining. so i decided to revert back to the 100Mb interface > (at least i'll get 10 MB/s) by disabling the ti ifconfig entry in > rc.conf and enabling fxp again. reboot. run my test again (again on fxp) > and i find i'm getting 2.67 MB/s now -- consistently. what? > so i remove the ti device from the kernel config and remove the > card from the system. still 2.67 MB/s on the fxp interface. > i am very curious to hear any hypotheses on this. > > and yes, i also only get 2.67 MB/s on the gig interface if it is alone > in the system. > > > ok. currently in our dell poweredge 4350 there is a 3com 3c985b with > > alteon-2 chipset plugged into a 64-bit pci slot. the kernel is built > > to use the ti driver (with kernel NMBCLUSTERS set to 16896). > > this is directly connected to a gig port on our extreme black diamond. > > a basic ip test of ftping to a known functional gig interface > > (an SGI origin 2000 also directly attached to our black diamond -- the > > same test on this interface with a similar interface on a separate > > module of this SGI box yields 12.183MB/s) yields a mere 2.37MB/s. > > both the gig port on the black diamond and the nic in the freebsd box > > are auto-negotiating. > > > > relevant /etc/sysctl.conf: > > net.inet.tcp.rfc1323=1 > > net.inet.tcp.sendspace=65536 > > net.inet.tcp.recvspace=65536 > > net.inet.udp.sendspace=65536 > > net.inet.udp.recvspace=65536 > > > > relevant /etc/rc.conf: > > icmp_drop_redirect="YES" > > inetd_enable="NO" > > kern_securelevel_enable="NO" > > moused_enable="NO" > > nfs_client_enable="YES" > > ntpdate_enable="YES" > > ntpdate_flags="10.10.10.11" > > sendmail_enable="NO" > > sshd_enable="NO" > > tcp_drop_synfin="YES" > > tcp_extensions="YES" > > tcp_keepalive="YES" > > usbd_enable="NO" > > > > we get similarly poor performance if we swap the 3com with an intel. > > > > more performance tuning suggestions are extremely welcomed. > > thanks in advance. > > -- > ------------------------------------ > Robin P. Blanchard > IT Program Specialist > Georgia Center for Continuing Ed. > fon: 706.542.2404 fax: 706.542.6546 > email: Robin_Blanchard@gactr.uga.edu > ------------------------------------ > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message -- ------------------------------------ Robin P. Blanchard IT Program Specialist Georgia Center for Continuing Ed. fon: 706.542.2404 fax: 706.542.6546 email: Robin_Blanchard@gactr.uga.edu ------------------------------------ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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