*BSD News Article 9133


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From: hasty@netcom.com (Amancio Hasty Jr)
Subject: Re: [386BSD] Xfree86, XS3 Mouse configuration
Message-ID: <1992Dec19.172946.10021@netcom.com>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
References: <BzGynG.E3J@NeoSoft.com> <1992Dec19.005008.5927@cbnewsj.cb.att.com> <1992Dec19.104955.16073@Informatik.TU-Muenchen.DE>
Date: Sat, 19 Dec 1992 17:29:46 GMT
Lines: 87

In article <1992Dec19.104955.16073@Informatik.TU-Muenchen.DE> roell@informatik.tu-muenchen.de (Thomas Roell) writes:
>>> While I have the utmost respect for Roell's contributions, I am saddened
>>> that he chose to flame Amancio like that.
>>
>>As are we all.
>
>I love to see this happen that Amancio turns everything I say into the
>opposite and against me personally. And also note that I did said any word
>about my contributions here, this is expilicitly about somebody elses
>contributions, which I'm really missing named.
>
>What drives me really crazy, most of them time when he posts something,
>he doesn't answer the question asked (see this recent ET4000 vs. ET4000/W32
>thread) instead he tells everybody how great his XS3 is. Besides this, read
>carefully his reply to my posting. What I said was basically:
>
>        - He talk on the net as if he was the only one doing XS3 alone
>        - The S3's graphics eingine differes only in one register from
>          a 8514/A
>
>What he answered was:
>
>        - The README contains other names
thomas forgot to mention that I cut and past my second statement on the
README file  stating clearly that XS3 was based on Kevin Martin's server.

>        - The S3's SVGA registers differ from that of a 8514/A (which is
>          natural since the 85: sserve!manuel.anu.edu.au!munnari.oz.au!hp9000.csc.cuhk.hk!saimiri.primate.wisc.edu!sdd.hp.com!cs.utexas.edu!uunet!spool.mu.edu!agate!agate.berkeley.edu!cgd
From: cgd@eden.CS.Berkeley.EDU (Chris G. Demetriou)
Newsgroups: comp.unix.bsd
Subject: Re: Dumb Question: Why 512 byte block?
Date: 19 Dec 92 00:07:39
Organization: Kernel Hackers 'r' Us
Lines: 62
Message-ID: <CGD.92Dec19000739@eden.CS.Berkeley.EDU>
References: <1992Dec18.005050.20594@decuac.dec.com>
	<1992Dec18.030833.7395@fcom.cc.utah.edu> <1gt736INNjje@menudo.uh.edu>
	<1992Dec18.235623.27538@fcom.cc.utah.edu>
NNTP-Posting-Host: eden.cs.berkeley.edu
In-reply-to: terry@cs.weber.edu's message of 18 Dec 92 23:56:23 GMT

In article <1992Dec18.235623.27538@fcom.cc.utah.edu> terry@cs.weber.edu (A Wizard of Earth C) writes:
>>I did not think that Fast Unix File System works this way.
>>If you have 6 1.5K files using 1K blocks,
>>   6 1k blocks will take each 1K from each file, and 
>>   3 1k blocks will take 0.5k from each file.
>>This was my understading from the famous FUFS paper.
>
>You can't split blocks between files.  A block is, by definition, the
>smallest possible allocation unit.  Thin about the case where you have
>a 1 byte file and a 1 block - 1 byte file; what would you do when
>adding one or two characters to the first (1 Byte)?  TReallocate?  Shift
>and reallocate for the last byte of the second file?

sorry.  you guys *both* sound confused.  first of all, i've never
seen a FFS with 1k blocks; the most "standard" configuration
is 4k or 8k blocks, with 8 fragments.

this yields fragments of (obviously) 512bytes and 1k.

you can't split *fragments* between one file.
you *can* split blocks between one file, but this tends not to happen,
because the FFS doesn't do this unless it's necessary.

so:  if you have 6 1.5k files, and the following filesystem setups,
you get the following results:

8k blocks, 8frags/block:  6 blocks assigned, but major fragmentation...
			  (actually, only 12 frags are used.  if your
			  filesystem is near full, < 6 blocks will be
			  assigned).

			  total space "actually used": 12k

8k blocks, 4frags/block:  6 blocks assigned, but major fragmentation...
			  (actually, only 6 frags are used.  if your
			  filesystem is near full, < 6 blocks will be
			  assigned).

			  total space "actually used": 12k

4k blocks, 8frags/block:  6 blocks assigned, but major fragmentation...
			  (actually, only 18 frags are used.  if your
			  filesystem is near full, < 6 blocks will be
			  assigned).

			  total space "actually used": 9k

4k blocks, 4frags/block:  6 blocks assigned, fragmentation "not too bad"...
			  (actually, 12 frags are used.  if your
			  filesystem is near full, < 6 blocks