Date: Tue, 4 Nov 1997 15:41:17 -0500 (EST) From: Charles Henrich <henrich@crh.cl.msu.edu> To: Don.Lewis@tsc.tdk.com, freebsd-hackers@freebsd.org Subject: Re: de0 errors Message-ID: <199711042041.PAA00471@crh.cl.msu.edu> References: <63m1kg$gii$1@msunews.cl.msu.edu>
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In lists.freebsd.hackers you write:
>On Nov 3, 5:15pm, Simon Shapiro wrote:
>} Subject: Re: de0 errors
>}
>} Hi Don Lewis; On 04-Nov-97 you wrote:
>}
>} ...
>}
>} > } Humm, tcpblast shows 4.0MB/sec. Granted this isnt an empty net
>} > either, fairly
>} > } busy I would imagine.
>} >
>} > That's probably a reasonable number for a 10Mb network, but not a
>} > 100Mb network. BTW, I bet this NIC is also hurting your disk I/O
>} > throughput since it is hogging the PCI bus because it's using an
>} > inefficient transfer method.
>}
>} I must be missing something. 4MB/sec. on TCP/IP over Ethernet is on a good
>} day, more than 40MHz. No?
>You're not missing anything, I slipped a decimal point. Sigh ...
>BTW, I just did some quick calculations and a 21140 + 440FX might still
>be able to drive the network at full speed without running out of PCI
>bandwidth. It's just that if you're transmitting, you'll consume about
>4x the transmit bandwidth on the PCI bus. If you're able to send at
>10MB/sec, then you'll consume about 40MB/sec on the PCI bus out of the
>theoretical 132MB/sec.
Im thinking of finding an Intel EtherExpress 100B card to see how that guy
will do. I also am handling easily 20 articles/sec out of news on this
system, along with 100+ readers, at a load average of about .8, so Im not
grumping :)
-Crh
--
Charles Henrich Michigan State University henrich@msu.edu
http://pilot.msu.edu/~henrich
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