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Date:      Mon, 28 May 2001 12:01:20 -0700 (PDT)
From:      Matthew Jacob <mjacob@feral.com>
To:        Andrew Gallatin <gallatin@cs.duke.edu>
Cc:        "Daniel C. Sobral" <dcs@newsguy.com>, alpha@FreeBSD.ORG
Subject:   Re: Latest on ' HEADS UP: loader broken'
Message-ID:  <Pine.LNX.4.21.0105281157590.23428-100000@zeppo.feral.com>
In-Reply-To: <15122.40785.294428.276049@grasshopper.cs.duke.edu>

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On Mon, 28 May 2001, Andrew Gallatin wrote:

> 
> Matthew Jacob writes:
>  > Turning on write cacheing isn't a generic workaround.
> 
> If you're afraid softupdates will melt your disks on -current it is. :-(

In general, write cacheing to drives is a bad idea w/o:

	a) UPS on the drives

		or

	b) close coordination with the filesystem so that the filesystem
	knows that a commit to media does not necessarily occur when you
	say "write this sucker". It would be nice if the filesystem also
	had knowledge of some kind to ensure on media commits.

This has been raised by hordan...

> 
>  > You should also note that isp_no_fwload && isp_mem_map no longer have any
>  > meaning for -current because the QLogic driver uses hints now.
>  > 
> 
> The main point is that it does NOT 
> 
>     \ Includes additional commands
>     include /boot/loader.4th
> 
>     \ Reads and processes loader.rc
>     start
> 
> Which means that I was able to survive the forth breakage..
> I've spent hours trying to figure out why the loader works for me.
> Now I've finally figured it out.


Ah. Yes, well, if you shoot all hoof && mouth disease victims and burn the
bodies on the spot, you probably can indeed survive.

This is the slightly more drastic but similar workaround as removing these

256 dictthreshold !  \ 256 cells minimum free space
2048 dictincrease !  \ 2048 additional cells each time

lines from loader.4th.


-matt



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