I does help (on average data) - about 50% can be normal for web pages and
plain text etc.
1. It's heavy on kernel memory
2. It's ineffective on much binary data
3. It's something else to go wrong
(4. It uses CPU cycles - not a problem any more!)
I implemented this on a much earlier version of cipe - it's way out of
date - but we have used it for a couple of years trouble free.
Much more interesting is packet compression by removing redundant ip/tcp/udp
header fields (a bit like VJ). This does not increase throughput much but it
has a massive effect on latency and hence responsiveness of interactive
Best regards to all
----- Original Message -----
To: "Karl Kleinpaste" <karl,AT,charcoal,DOT,com>
Sent: Monday, May 28, 2001 1:21 AM
Subject: Re: Packet compression
> On 27 May 2001, Karl Kleinpaste wrote:
> > ewheeler,AT,kaico,DOT,com writes:
> > > Would there be any appreciable performance increase over low bandwidth
> > > lines if the packets were compressed using zlib before they were
> > > encrypted?
> > It doesn't do that much good. But it helps a little.
> > As a comparison point, experiment a bit with ssh, using different
> > compression levels in .ssh/config, e.g.
> > Host your.chosen.test.destination.host
> > Compression yes
> > CompressionLevel 9
> > Try various digits, and do some large file copying over your slow link
> > with scp. Time the results.
> I know this can help alot w/ ssh on plain text and the like but I was
> wondering specifically about CIPE. Could this be implemented inthe packet
> encapsulation and would we see a performance increase accross low
> bandwidth lines. My guess is that it would; I just took a block of
> [root@dev dev]# dd if=/var/log/messages bs=1400 count=1 | gzip -v9 | wc -c
> 1+0 records in
> 1+0 records out
> You can see that even for mall 1400 byte packets we can get a 77% size
> cut. Would it be feasible to implement this into CIPE?
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