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- Newsgroups: comp.unix.sysv386
- Path: sparky!uunet!sandr!dlucy
- From: dlucy@sandr.COM (Douglas Lucy)
- Subject: Re: Ethernet Cards -- Questions
- Organization: S&R Software, Inc.
- Distribution: usa
- Date: Thu, 27 Aug 1992 14:44:11 GMT
- Message-ID: <1992Aug27.144411.15807@sandr.COM>
- Summary: How to tune performance with 16 KB RAM
- References: <Bt6E06.3FD@gator.rn.com> <1992Aug18.143632.2130@i88.isc.com> <1992Aug22.213857.5519@demesne.uucp>
- Lines: 29
-
- In article <1992Aug22.213857.5519@demesne.uucp> steph@demesne.uucp (Steph Marr) writes:
- > stevea@i88.isc.com (Steve Alexander) writes:
- >
- > >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.
- >
- >This is indeed the real win. The more RAM there is on the card, the larger
- >you can make the recieve window, and the more frames you can have outstanding
- >on the card waiting for transmission. As Steve points out, this can enable the
- >card to receive multiple frames and the kernel can pull all of the available
- >frames off the card during a single interrupt service. Since there's a real
- >amount of overhead to service each interrupt, getting more done per interrupt
- >is a win (albeit not a huge one). I've generally found 16KB to be the minimum
- >magic number.
-
- Are you talking about kernel parameters? Should I be configuring some
- set of tunable parameters (this is SCO Unix 3.2.2) for better
- peformance with my WD8013?
-
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- | Doug Lucy, Chief Geek | "It just doesn't matter" | in /dev/null, |
- | S&R Software, Inc | -Bill Murray | no one can |
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