Date: Wed, 13 Jun 2001 18:03:32 -0700 From: "Robert L Sowders" <rsowders@usgs.gov> To: "Robin P. Blanchard" <Robin_Blanchard@gactr.uga.edu> Cc: owner-freebsd-stable@FreeBSD.ORG, stable@freebsd.org Subject: Re: gigabit woes Message-ID: <OF532AACAB.95369B84-ON88256A6B.00050D29@wr.usgs.gov>
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Ok now your into something I've seen before.
Had the same problem here with 100mb cards. ifconfig showed them set at
100mb full duplex. I thought everything was fine. Nope. It was trying
to auto negotiate with the other nic, which was also trying to auto
negotiate. It ended up with one going to full duplex and the other going
to something else. Hence the slow performance. The problem went away
when we forced one of the cards to 100mb full duplex.
Sorry don't remember how to do this. But it's been discussed in the list
before, do a search for full duplex and force and you should find it.
"Robin P. Blanchard" <Robin_Blanchard@gactr.uga.edu>
Sent by: owner-freebsd-stable@FreeBSD.ORG
06/13/2001 10:36 AM
To: stable@freebsd.org
cc:
Subject: Re: gigabit woes
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
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--
------------------------------------
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
------------------------------------
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