[dpdk-dev] [PATCH] eal: warn on --no-huge allocation requirement

[Burakov, Anatoly]

On 18-Jul-19 11:29 AM, Thomas Monjalon wrote:
> 18/07/2019 12:18, Burakov, Anatoly:
>> On 18-Jul-19 10:34 AM, Thomas Monjalon wrote:
>>> When using --no-huge mode, dynamic allocation is not supported.
>>> Because of this limitation, the option --legacy-mem is implied
>>> and -m may be needed to specify the amount of memory to allocate.
>>> Otherwise the default amount MEMSIZE_IF_NO_HUGE_PAGE will be allocated.
>>>
>>> Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
>>> ---
>>>    lib/librte_eal/common/eal_common_options.c | 4 ++++
>>>    1 file changed, 4 insertions(+)
>>>
>>> diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
>>> index 512d5088e..4a76929ea 100644
>>> --- a/lib/librte_eal/common/eal_common_options.c
>>> +++ b/lib/librte_eal/common/eal_common_options.c
>>> @@ -1551,6 +1551,10 @@ eal_check_common_options(struct internal_config *internal_cfg)
>>>    			"be specified at the same time\n");
>>>    		return -1;
>>>    	}
>>> +	if (internal_cfg->no_hugetlbfs && internal_cfg->memory == 0) {
>>> +		RTE_LOG(NOTICE, EAL, "Option --"OPT_NO_HUGE" uses legacy mode, "
>>> +			"option -m would override default memory allocation\n");
>>
>> I think this is too technical and misleading. I don't think user cares
>> about legacy vs dynamic mode here. I would rather print out something
>> more informative, like, say, something along those lines:
>>
>> "Option --no-huge was specified in command-line arguments. This mode
>> uses static memory layout and will allocate %dMB of memory by default.
>> Option '-m' can be used to increase allocated memory amount."
>>
>> where %d is the amount of memory we're preallocating.
> 
> %d is defined in eal.c
> It requires to move the value in a common .h
> 
> I may try something like you suggest in shorter.
> A log is supposed to be short :)
> 

OK, maybe not print the value and make it shorter, but definitely don't 
confuse the user with talk about legacy modes :)

-- 
Thanks,
Anatoly