svn commit: r298230 - in head: lib/libstand sys/boot/common sys/boot/efi/libefi sys/boot/efi/loader sys/boot/i386/libfirewire sys/boot/i386/libi386 sys/boot/i386/loader sys/boot/mips/beri/loader sy...

[Allan Jude]

On 2016-04-18 22:59, Devin Teske wrote:
> 
>> On Apr 18, 2016, at 6:37 PM, Allan Jude <allanjude at FreeBSD.org
>> <mailto:allanjude at FreeBSD.org>> wrote:
>>
>> On 2016-04-18 21:32, Devin Teske wrote:
>>>
>>>> On Apr 18, 2016, at 6:06 PM, Pedro Giffuni <pfg at FreeBSD.org
>>>> <mailto:pfg at FreeBSD.org>> wrote:
>>>>
>>>>
>>>>
>>>> On 04/18/16 19:30, Devin Teske wrote:
>>>>>
>>>>>
>>>>>> On Apr 18, 2016, at 4:43 PM, Allan Jude <allanjude at FreeBSD.org
>>>>>> <mailto:allanjude at FreeBSD.org>
>>>>>> <mailto:allanjude at FreeBSD.org>> wrote:
>>>>>>
>>>>>> On 2016-04-18 19:36, Adrian Chadd wrote:
>>>>>>> Someone pointed out how this bloats out memory requirement in loader.
>>>>>>>
>>>>>>> Did anyone check that?
>>>>>>>
>>>>>>> -adrian
>>>>>>>
>>>>>>
>>>>>> I tested down to 128mb of ram in QEMU, booted from the installer ISO,
>>>>>> did the install, and booted the installed system without issue.
>>>>>
>>>>> Hmm. Would be nice if we could claim success under 64MB too.
>>>>> If you get the chance.
>>>>> How low can it go?
>>>>
>>>> FWIW, The code review comments state:
>>>>
>>>> <quote>
>>>>
>>>> BTW: as mentioned in very beginning of this project, I'm reserving
>>>> fairly large chunk of memory (64MB) for loader and using same amount
>>>> for both BIOS/UEFI variants, default in freebsd is 3MB, eventually
>>>> this should be reviewed, but currently it will affect very small setups.
>>>>
>>>> </quote>
>>>>
>>>> I still think it's pretty cool, thanks to everyone involved.
>>>>
>>>
>>> Does anyone know what the original memory reservation amount was
>>> before it was upped to 64MB?
>>>
>>
>> It was 3MB
>>
> 
> Next [possibly] dumb question(s).
> 
> Is it easily tunable?
> If not, why not?
> What happens when we want to bump it further in the future?
> -- 
> Devin

So, the size of the heap, is a #define in
sys/boot/{i386/libi386,pc98/libpc98}/biosmem.c sys/boot/efi/libefi/libefi.c

It went from 3MB to 64MB

The size of the block cache is set in each of the respective loaders
with the call to bcache_init(). The size went from 16kb to 16mb.

-- 
Allan Jude