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- Newsgroups: comp.unix.sysv386
- Path: sparky!uunet!wupost!zaphod.mps.ohio-state.edu!ncar!ico!newsserver.pixel.kodak.com!laidbak!stevea
- From: stevea@i88.isc.com (Steve Alexander)
- Subject: Re: Ethernet Cards -- Questions
- Message-ID: <1992Aug18.143632.2130@i88.isc.com>
- Sender: usenet@i88.isc.com (Usenet News)
- Nntp-Posting-Host: ozzy.i88.isc.com
- Organization: INTERACTIVE Systems Corporation, Naperville, IL
- References: <18338@polstra.UUCP> <Bt6E06.3FD@gator.rn.com>
- Date: Tue, 18 Aug 1992 14:36:32 GMT
- Lines: 23
-
- In article <Bt6E06.3FD@gator.rn.com> larry@gator.rn.com (Larry Snyder) writes:
- >I would like to know if under Unix there is a noticable difference
- >between a 8 and 16 bit card? Does the driver in the kernel actually
- >do 16 bit data transfers from the buss (assuming a 16 bit board)?
-
- If you have the right driver, it will access the board 16 bits at a time.
- This can lead to quite a throughput improvement (I've measured this as
- almost twice as fast when just pumping packets to the ethernet driver
- directly).
-
- The other advantage of the 8013 over the 8003 is that it has a 16K onboard
- packet buffer, which lets you use 8K NFS reads, and larger TCP windows (I
- use 24K around here). It also lets you use full length TCP segments (1460
- vs 1024), which when combined with the larger window makes things run a lot
- faster. On the 8K card, you only have 5 or 6 K of input packet buffers,
- which is not a lot when you're trying to keep up with a SparcStation or
- a 386/33.
-
- The last time we bought an 8013 it was ~$170. Well worth the money if you
- care about performance.
- --
- Steve Alexander, Software Technologies Group | stevea@i88.isc.com
- INTERACTIVE Systems Corporation, Naperville, IL | ...!{sun,ico}!laidbak!stevea
-