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: [EMAIL PROTECTED]
> ------------------------------------
>
> To Unsubscribe: send mail to [EMAIL PROTECTED]
> 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: [EMAIL PROTECTED]
------------------------------------
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-stable" in the body of the message
