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- Path: news.ao.net!not-for-mail
- From: eric@eola.ao.net (Butt-head)
- Newsgroups: comp.dcom.modems,comp.sys.mac.comm
- Subject: Re: I've Had It With Supra 28.8. It's a piece of shit.
- Followup-To: comp.dcom.modems,comp.sys.mac.comm
- Date: 5 Jan 1996 06:05:22 GMT
- Organization: Access Orlando
- Message-ID: <4cif32$7op@news.accessorl.net>
- References: <49kmbp$3hn@news.mel.aone.net.au>
- NNTP-Posting-Host: eola.accessorl.net
- X-Newsreader: TIN [UNIX 1.3 950515BETA PL0]
-
- Ed Williams (cedward@awod.com) wrote:
- : I also disagree with Mr. Miller. It is well known that MNP5 is _superior_ to V.42bis, and binhexed files ar ASCII text files by defi=
- : nition, however they may have been compressed. MNP5 is not as efficient as V.42bis on a random mix of text and binaries. But since
- : I download binhexed files almost exclusively - and I do quite a bit
- : of up- and downloading, I keep MNP5 enabled all the time and have not
- : seen the performance hit that Miller's post predicts. BTW, I've tried
- : downloading the same binaries with both compressions and the perform-
- : ance difference is small enough for me to accept. Cheers and Happy New
- : Year to all ...
-
- The performance hit is small for one of three reasons:
-
- 1. (more likely) you need to set your serial port rate higher. You are
- being limited by the transfer between your modem and serial port rather than
- transfer between the modems.
-
- 2. You have a REALLY, REALLY, slow system.
-
- 3. You are using a PPP/SLIP connection (which incorporates compression
- before the data gets to the modem) or some other protocal with its own
- compression, and are using a really big MTU size, so that the delays
- between blocks that MNP sends don't have as much of an effect.
-
- v.42bis is SIGNIFICANTLY FASTER than MNP5 in almost ALL cases where modem
- speed (not serial port speed or CPU speed) is the limiting factor. Even
- in those cases v.42bis is still faster, but not by as much.
-