on 04/04/2013 20:16 John Baldwin said the following:
> On Thursday, April 04, 2013 12:16:32 pm Andriy Gapon wrote:
>> diff --git a/sys/boot/i386/zfsboot/zfsboot.c
> b/sys/boot/i386/zfsboot/zfsboot.c
>> index 82402b6..12ceeb0 100644
>> --- a/sys/boot/i386/zfsboot/zfsboot.c
>> +++ b/sys/boot/i386/zfsboot/zfsboot.c
>> @@ -374,6 +374,16 @@ bios_getmem(void)
>> }
>>
>> /*
>> + * If extended memory is at least twice as large as the largest
>> + * region of higher memory, then carve the high heap out of
>> + * extended memory.
>> + */
>> + if (bios_extmem > 2 * high_heap_size) {
>> + high_heap_base = 0x100000 + bios_extmem / 2;
>> + high_heap_size = bios_extmem / 2;
>> + }
>> +
>> + /*
>> * If we have extended memory and did not find a suitable heap
>> * region in the SMAP, use the last 3MB of 'extended' memory as a
>> * high heap candidate.
>>
>
> We should really use the same algorithm in boot2 and gptboot as well.
Yes, this is just something to start with.
BTW, all other components use bios_getmem from sys/boot/i386/libi386/biosmem.c ?
> I think though that in this case you can just use the last 3MB of heap
> rather than half of the extended memory as heap.
I thought the more the better? :-)
I've kept the block of code that tries to make high_heap_size at least 3MB.
--
Andriy Gapon
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