svn commit: r304187 - in head: . share/man/man4 sys/conf sys/dev/mcd sys/modules sys/modules/mcd

Warner Losh imp at bsdimp.com
Fri Aug 19 03:28:58 UTC 2016


On Thu, Aug 18, 2016 at 12:50 AM, Julian Elischer <julian at freebsd.org> wrote:
> On 16/08/2016 4:54 AM, John Baldwin wrote:
>>
>> On Monday, August 15, 2016 08:38:02 PM John Baldwin wrote:
>>>
>>> Author: jhb
>>> Date: Mon Aug 15 20:38:02 2016
>>> New Revision: 304187
>>> URL: https://svnweb.freebsd.org/changeset/base/304187
>>>
>>> Log:
>>>    Remove the mcd(4) driver for Mitsumi CD-ROM players.
>>>       This is a driver for a pre-ATAPI ISA CD-ROM adapter.  As noted in
>>>    the manpage, this driver is only useful as a backend to cdcontrol to
>>>    play audio CDs since it doesn't use DMA, so its data performance is
>>>    "abysmal" (and that was true in the mid 90's).
>>
>> No one stepped up to test patches for it either when I last posted patches
>> to
>> convert it from timeout(9) to callout(9).  I have a few more drivers that
>> are
>> both very old and that people have no business using in 12 (think ISA
>> adapters that don't do DMA and can't be used with pccard) that I will be
>> removing over the next little while.  I brought up a list of drivers on
>> arch@
>> a couple of years ago and the conversation drifted off into the weeds
>> about
>> trimming GENERIC, etc.  No one objected to the specific drivers I listed
>> though (and I got a few pleas of "please remove").  If someone shows up
>> desperately clutching an ISA adapter they can always dig up the source
>> from
>> svn and deal with forward porting it for whatever API changes have
>> happened
>> since it was removed.
>
>
> I would imagine any machine still holding one of these probably has not
> enough memory to run FreeBSD.
>
> would we still run in 2MB?

With insane levels of tuning, we can run in 32MB userland that can do
things. Even 64MB is tight w/o some tuning. 16MB is almost certainly
right out except for very specialized situations. 2MB? We can't even
load the loader in that :(. Oh, and all these memory configs are only
possible if you tweak the loader's block cache...

Warner


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