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From: src@scuzzy.in-berlin.de (Heiko Blume)
Newsgroups: comp.unix.sysv386
Subject: Re: binary Mach distribution for 386
Message-ID: <1991Jan15.182524.14868@scuzzy.in-berlin.de>
Date: 15 Jan 91 18:25:24 GMT
References: <13963@uswat.UUCP> <1991Jan4.140341.11874@granite.cr.bull.com> <1991Jan05.021138.17495@scuzzy.in-berlin.de> <1991Jan5.180851.24
Organization: Contributed Software
Lines: 32

shore@mtxinu.COM (Melinda Shore) writes:

>In article <1991Jan10.163048.20613@scuzzy.in-berlin.de> src@scuzzy.in-berlin.de (Heiko Blume) writes:
>>i think all those intelligent peripherals, like scsi host adapters, multiport
>>and ethernet cards, with their own processors and RAM can help a lot with
>>these performance problems. 

>For example, when E&S
>was bringing Mach up on their ill-fated supercomputer, they found
>that they were only getting 500K throughput on a 10 megabit ethernet.
>The problem turned out to be that the folks at CMU had replaced
>the software interrupt mechanism for moving packets into the protocol
>layer with a kernel thread.  The network code, of course, was
>pre-tahoe BSD, so they should have been seeing about 1.5 megabits.
>You all can do the arithmetic.

that's why i mentioned the intelligent peripherals. it's necessary
to offload the network code to the interface anyway. for example, with host
based tcp/ip over 100Mbit FDDI you get about 20Mbit/s max throughput.
if you use the FDDI- and TCP/IP-chips you get about 70Mbit/s.
i think that clearly shows the way to go.

>And,
>if you want to see Mach 3.0 any time in the near future, I would
>suggest looking into getting an AT&T source license.

just a little bit too expensive...
-- 
      Heiko Blume <-+-> src@scuzzy.in-berlin.de <-+-> (+49 30) 691 88 93
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